deps: update dependency com.google.cloud:google-cloud-firestore-bom to v3 (#2457)
deps: update dependency com.google.cloud:google-cloud-firestore-bom to v3 (#2457)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.google.cloud:google-cloud-firestore-bom](https://togithub.com/googleapis/java-firestore) | `2.6.2` -> `3.0.0` | [![age](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-firestore-bom/3.0.0/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-firestore-bom/3.0.0/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-firestore-bom/3.0.0/compatibility-slim/2.6.2)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-firestore-bom/3.0.0/confidence-slim/2.6.2)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

<details>
<summary>googleapis/java-firestore</summary>

### [`v3.0.0`](https://togithub.com/googleapis/java-firestore/blob/master/CHANGELOG.md#​300-httpswwwgithubcomgoogleapisjava-firestorecomparev262v300-2021-08-09)

[Compare Source](https://togithub.com/googleapis/java-firestore/compare/v2.6.2...v3.0.0)

##### ⚠ BREAKING CHANGES

*   update Java compile to 1.8 ([#​710](https://togithub.com/googleapis/java-firestore/pull/710))
*   update gapic generator to 2.0.0, java 8 features ([#​719](https://togithub.com/googleapis/java-firestore/issues/719))

##### Features

*   update Java compile to 1.8 ([#​710](https://togithub.com/googleapis/java-firestore/pull/710))
*   gapic-generator-java v1.0.13, mtls support ([#​712](https://www.togithub.com/googleapis/java-firestore/issues/712)) ([a27dd9c](https://www.togithub.com/googleapis/java-firestore/commit/a27dd9cb0e2681a15eae754c97255d0d8c86bcae))
*   update gapic generator to 2.0.0, java 8 features ([#​719](https://www.togithub.com/googleapis/java-firestore/issues/719)) ([0d5b378](https://www.togithub.com/googleapis/java-firestore/commit/0d5b378075f3723126c8809f4afcc8fc9f81d611))

##### Dependencies

*   update shared dependencies to 2.0.0 ([#​720](https://www.togithub.com/googleapis/java-firestore/issues/720)) ([e4f985e](https://www.togithub.com/googleapis/java-firestore/commit/e4f985e8b17a02f84aa9b100be1aa72f97521763))

##### [2.6.2](https://www.togithub.com/googleapis/java-firestore/compare/v2.6.1...v2.6.2) (2021-07-29)

##### Bug Fixes

*   Add shopt -s nullglob to dependencies script ([8f4b199](https://www.togithub.com/googleapis/java-firestore/commit/8f4b199c1dfdf268723e11696733fe5fb6bd5c64))
*   Ensures bundles are encoded as UTF8 bytes. ([#​695](https://www.togithub.com/googleapis/java-firestore/issues/695)) ([0946a17](https://www.togithub.com/googleapis/java-firestore/commit/0946a170a963f50ec77409291c02696f2c416edb))
*   lower batch size on BulkWriter retry ([#​688](https://www.togithub.com/googleapis/java-firestore/issues/688)) ([146b21d](https://www.togithub.com/googleapis/java-firestore/commit/146b21dd6d5772bfd9e023dbf5a1147b29076cdd))
*   Update dependencies.sh to not break on mac ([#​694](https://www.togithub.com/googleapis/java-firestore/issues/694)) ([8f4b199](https://www.togithub.com/googleapis/java-firestore/commit/8f4b199c1dfdf268723e11696733fe5fb6bd5c64))

##### Documentation

*   began merging variant client samples ([#​696](https://www.togithub.com/googleapis/java-firestore/issues/696)) ([0a10dd8](https://www.togithub.com/googleapis/java-firestore/commit/0a10dd85de02647a9d08f41d45ebc25ee2689a52))

##### [2.6.1](https://www.togithub.com/googleapis/java-firestore/compare/v2.6.0...v2.6.1) (2021-06-30)

##### Dependencies

*   update dependency com.google.cloud:google-cloud-shared-dependencies to v1.4.0 ([#​680](https://www.togithub.com/googleapis/java-firestore/issues/680)) ([b8ffcb4](https://www.togithub.com/googleapis/java-firestore/commit/b8ffcb43d79029f9b2a490fb84e78653c716b367))

</details>

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