deps: update dependency com.google.protobuf:protobuf-java to v3.20.0 (#343)
deps: update dependency com.google.protobuf:protobuf-java to v3.20.0 (#343)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.google.protobuf:protobuf-java](https://developers.google.com/protocol-buffers/) ([source](https://togithub.com/protocolbuffers/protobuf)) | `3.19.4` -> `3.20.0` | [![age](https://badges.renovateapi.com/packages/maven/com.google.protobuf:protobuf-java/3.20.0/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.protobuf:protobuf-java/3.20.0/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.protobuf:protobuf-java/3.20.0/compatibility-slim/3.19.4)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.protobuf:protobuf-java/3.20.0/confidence-slim/3.19.4)](https://docs.renovatebot.com/merge-confidence/) |

---

### Release Notes

<details>
<summary>protocolbuffers/protobuf</summary>

### [`v3.20.0`](https://togithub.com/protocolbuffers/protobuf/releases/v3.20.0)

2022-03-25 version 3.20.0 (C++/Java/Python/PHP/Objective-C/C#/Ruby/JavaScript)

### C++

-   Add option to use external GTest in CMake ([#&#8203;8736](https://togithub.com/protocolbuffers/protobuf/issues/8736))
-   cmake: Set correct sonames for libprotobuf-lite.so and libprotoc.so ([#&#8203;8635](https://togithub.com/protocolbuffers/protobuf/issues/8635)) ([#&#8203;9529](https://togithub.com/protocolbuffers/protobuf/issues/9529))

### Java

-   Revert "Standardize on Array copyOf" ([#&#8203;9400](https://togithub.com/protocolbuffers/protobuf/issues/9400))
-   Resolve more java field accessor name conflicts ([#&#8203;8198](https://togithub.com/protocolbuffers/protobuf/issues/8198))

### Python

-   Pin multibuild scripts to get manylinux1 wheels back ([#&#8203;9216](https://togithub.com/protocolbuffers/protobuf/issues/9216))
-   Dropped support for Python < 3.7 ([#&#8203;9480](https://togithub.com/protocolbuffers/protobuf/issues/9480))

### PHP

-   fix: \[PHP] add missing reserved classnames ([#&#8203;9458](https://togithub.com/protocolbuffers/protobuf/issues/9458))

### Ruby

-   Dropped Ruby 2.3 and 2.4 support for CI and releases. ([#&#8203;9311](https://togithub.com/protocolbuffers/protobuf/issues/9311))
-   \[Ruby] Message.decode/encode: Add max_recursion_depth option ([#&#8203;9218](https://togithub.com/protocolbuffers/protobuf/issues/9218))
-   Ruby: rename max_recursion_depth to recursion_limit ([#&#8203;9486](https://togithub.com/protocolbuffers/protobuf/issues/9486))
-   Fix conversion of singleton classes in Ruby ([#&#8203;9342](https://togithub.com/protocolbuffers/protobuf/issues/9342))
-   Suppress warning for intentional circular require ([#&#8203;9556](https://togithub.com/protocolbuffers/protobuf/issues/9556))
-   \[Ruby] allow encode json options to be an object that responds to to_hash ([#&#8203;9513](https://togithub.com/protocolbuffers/protobuf/issues/9513))

### Other

-   \[C#] Fix trim warnings ([#&#8203;9182](https://togithub.com/protocolbuffers/protobuf/issues/9182))
-   Add protoc-gen-go-svc to options.md ([#&#8203;9280](https://togithub.com/protocolbuffers/protobuf/issues/9280))
-   Fixes NullReferenceException when accessing FieldDescriptor.IsPacked ([#&#8203;9430](https://togithub.com/protocolbuffers/protobuf/issues/9430))
-   Add ToProto() method to all C# descriptor classes ([#&#8203;9426](https://togithub.com/protocolbuffers/protobuf/issues/9426))
-   Add cmake option `protobuf_INSTALL` to not install files ([#&#8203;7123](https://togithub.com/protocolbuffers/protobuf/issues/7123))
-   \[CMake] Allow custom plugin options e.g. to generate mocks ([#&#8203;9105](https://togithub.com/protocolbuffers/protobuf/issues/9105))
-   Add an option to preserve proto names in JsonFormatter ([#&#8203;6307](https://togithub.com/protocolbuffers/protobuf/issues/6307))
-   Add test scope to kotlin-test for protobuf-kotlin-lite ([#&#8203;9518](https://togithub.com/protocolbuffers/protobuf/issues/9518))
-   Add prefix_to_proto_package_mappings_path ObjC option. ([#&#8203;9498](https://togithub.com/protocolbuffers/protobuf/issues/9498))
-   \[ObjC] Rename `proto_package_to_prefix_mappings_path` to `package_to_prefix_mappings_path`. ([#&#8203;9552](https://togithub.com/protocolbuffers/protobuf/issues/9552))
-   cmake: Use linker version scripts ([#&#8203;9545](https://togithub.com/protocolbuffers/protobuf/issues/9545))
-   Add a generation option to control use of forward declarations in headers. ([#&#8203;9568](https://togithub.com/protocolbuffers/protobuf/issues/9568))
-   \[C#] fix parse failure for extensions with large field numbers ([#&#8203;9591](https://togithub.com/protocolbuffers/protobuf/issues/9591))

</details>

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