deps: update dependency com.google.cloud:google-cloud-networkconnecti…

…vity-bom to v1.2.8 (#5322)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.google.cloud:google-cloud-networkconnectivity-bom](https://togithub.com/googleapis/java-networkconnectivity) | `1.2.7` -> `1.2.8` | [![age](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-networkconnectivity-bom/1.2.8/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-networkconnectivity-bom/1.2.8/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-networkconnectivity-bom/1.2.8/compatibility-slim/1.2.7)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-networkconnectivity-bom/1.2.8/confidence-slim/1.2.7)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

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

### [`v1.2.8`](https://togithub.com/googleapis/java-networkconnectivity/blob/HEAD/CHANGELOG.md#&#8203;128-httpsgithubcomgoogleapisjava-networkconnectivitycomparev127v128-2022-10-03)

[Compare Source](https://togithub.com/googleapis/java-networkconnectivity/compare/v1.2.7...v1.2.8)

##### Dependencies

-   Update dependency com.google.cloud:google-cloud-shared-dependencies to v3.0.4 ([#&#8203;321](https://togithub.com/googleapis/java-networkconnectivity/issues/321)) ([bde5bc3](https://togithub.com/googleapis/java-networkconnectivity/commit/bde5bc38dca5df2a093b843d2dcd71598b28e7af))

</details>

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google-cloud-bom/pom.xml

@@ -573,7 +573,7 @@
       <dependency>
         <groupId>com.google.cloud</groupId>
         <artifactId>google-cloud-networkconnectivity-bom</artifactId>
-        <version>1.2.7</version>
+        <version>1.2.8</version>
         <type>pom</type>
         <scope>import</scope>
       </dependency>