deps: update dependency com.google.cloud:google-cloud-spanner-jdbc to v2.7.8 (#5431)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.google.cloud:google-cloud-spanner-jdbc](https://github.com/googleapis/java-spanner-jdbc) | `2.7.7` -> `2.7.8` | [![age](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-spanner-jdbc/2.7.8/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-spanner-jdbc/2.7.8/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-spanner-jdbc/2.7.8/compatibility-slim/2.7.7)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-spanner-jdbc/2.7.8/confidence-slim/2.7.7)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

<details>
<summary>googleapis/java-spanner-jdbc</summary>

### [`v2.7.8`](https://github.com/googleapis/java-spanner-jdbc/blob/HEAD/CHANGELOG.md#&#8203;278-httpsgithubcomgoogleapisjava-spanner-jdbccomparev277v278-2022-10-03)

[Compare Source](https://github.com/googleapis/java-spanner-jdbc/compare/v2.7.7...v2.7.8)

##### Bug Fixes

-   Upgrade native image plugin to 0.9.14 to unblock graalvm 22.2 update ([#&#8203;998](https://github.com/googleapis/java-spanner-jdbc/issues/998)) ([e5ed330](https://github.com/googleapis/java-spanner-jdbc/commit/e5ed3300780eec0a32c0f135415063f65fb5ca82))

##### Dependencies

-   Update dependency com.google.cloud:google-cloud-shared-dependencies to v3.0.4 ([#&#8203;1001](https://github.com/googleapis/java-spanner-jdbc/issues/1001)) ([feafe10](https://github.com/googleapis/java-spanner-jdbc/commit/feafe1076c7e272bfe69fe055f742072b5aac763))
-   Update dependency com.google.cloud:google-cloud-spanner-bom to v6.30.1 ([#&#8203;973](https://github.com/googleapis/java-spanner-jdbc/issues/973)) ([205f312](https://github.com/googleapis/java-spanner-jdbc/commit/205f312ab3466e9efb3fc3c79ddc9644adcca527))
-   Update dependency com.google.cloud:google-cloud-spanner-bom to v6.30.2 ([#&#8203;976](https://github.com/googleapis/java-spanner-jdbc/issues/976)) ([037a33a](https://github.com/googleapis/java-spanner-jdbc/commit/037a33a932d2a50412bc53cc05cf512a9d2a4548))
-   Update dependency com.google.cloud:google-cloud-spanner-bom to v6.31.0 ([#&#8203;1000](https://github.com/googleapis/java-spanner-jdbc/issues/1000)) ([59d69fb](https://github.com/googleapis/java-spanner-jdbc/commit/59d69fb6548d7e1d23fc8285faa975befd00323a))
-   Update dependency org.graalvm.buildtools:junit-platform-native to v0.9.14 ([#&#8203;977](https://github.com/googleapis/java-spanner-jdbc/issues/977)) ([32c881e](https://github.com/googleapis/java-spanner-jdbc/commit/32c881ea6530d23385f0c001e99d767146544210))
-   Update dependency org.junit.vintage:junit-vintage-engine to v5.9.1 ([#&#8203;974](https://github.com/googleapis/java-spanner-jdbc/issues/974)) ([fab57d9](https://github.com/googleapis/java-spanner-jdbc/commit/fab57d9adea37ca4c3aa9aeb8d11e086ba86e538))

</details>

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Author: renovate-bot

google-cloud-bom/pom.xml

@@ -772,7 +772,7 @@
       <dependency>
         <groupId>com.google.cloud</groupId>
         <artifactId>google-cloud-spanner-jdbc</artifactId>
-        <version>2.7.7</version>
+        <version>2.7.8</version>
       </dependency>
       <dependency>
         <groupId>com.google.cloud</groupId>