deps: update dependency com.google.cloud:google-cloud-bigquerystorage-bom to v2.8.0 (#3382)
deps: update dependency com.google.cloud:google-cloud-bigquerystorage-bom to v2.8.0 (#3382)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.google.cloud:google-cloud-bigquerystorage-bom](https://togithub.com/googleapis/java-bigquerystorage) | `2.7.0` -> `2.8.0` | [![age](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-bigquerystorage-bom/2.8.0/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-bigquerystorage-bom/2.8.0/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-bigquerystorage-bom/2.8.0/compatibility-slim/2.7.0)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-bigquerystorage-bom/2.8.0/confidence-slim/2.7.0)](https://docs.renovatebot.com/merge-confidence/) |

---

### Release Notes

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

### [`v2.8.0`](https://togithub.com/googleapis/java-bigquerystorage/blob/HEAD/CHANGELOG.md#&#8203;280-httpswwwgithubcomgoogleapisjava-bigquerystoragecomparev270v280-2021-12-30)

[Compare Source](https://togithub.com/googleapis/java-bigquerystorage/compare/v2.7.0...v2.8.0)

##### Features

-   Add ignoreUnknownField support in JsonWriter ([#&#8203;1455](https://www.togithub.com/googleapis/java-bigquerystorage/issues/1455)) ([4616adb](https://www.github.com/googleapis/java-bigquerystorage/commit/4616adb30d07d7be522b74837adae080eca103a6))
-   Add reconnect support to v1 client lib. ([#&#8203;1446](https://www.togithub.com/googleapis/java-bigquerystorage/issues/1446)) ([a5157fa](https://www.github.com/googleapis/java-bigquerystorage/commit/a5157faf37354ee48a0af930a68edf4823b5be6f))
-   add schema update support in JsonStreamWriter ([#&#8203;1447](https://www.togithub.com/googleapis/java-bigquerystorage/issues/1447)) ([973afcc](https://www.github.com/googleapis/java-bigquerystorage/commit/973afccc22507b8109b3920d3fc183692dcc66c2))
-   support `append()` without offset in `StreamWriter` ([#&#8203;1452](https://www.togithub.com/googleapis/java-bigquerystorage/issues/1452)) ([cb8b0ad](https://www.github.com/googleapis/java-bigquerystorage/commit/cb8b0ad25fbf07c3509b3d94244a999b9cb90e54))

##### Bug Fixes

-   allow all fields to be null values ([#&#8203;1450](https://www.togithub.com/googleapis/java-bigquerystorage/issues/1450)) ([e47ac79](https://www.github.com/googleapis/java-bigquerystorage/commit/e47ac791765486f02f027d3c440645ef2a379ba9))
-   finish BIGNUMERIC support ([#&#8203;1449](https://www.togithub.com/googleapis/java-bigquerystorage/issues/1449)) ([d9d51cd](https://www.github.com/googleapis/java-bigquerystorage/commit/d9d51cd203733a972c80e312e9e279b50fb260fa))
-   fix a NullPtr when user closes a writer without connection being ever established ([#&#8203;1454](https://www.togithub.com/googleapis/java-bigquerystorage/issues/1454)) ([b774f5d](https://www.github.com/googleapis/java-bigquerystorage/commit/b774f5d0d00275278708d1299b4912b455be4bed))
-   update storageError support due to server side enhancement ([#&#8203;1456](https://www.togithub.com/googleapis/java-bigquerystorage/issues/1456)) ([6243ad5](https://www.github.com/googleapis/java-bigquerystorage/commit/6243ad5cba61d4dae7f4ceb60b09c625e7589215))

</details>

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