Bump bom-2.176.x from 11 to 12 (#371)

Bumps [bom-2.176.x](https://github.com/jenkinsci/pom) from 11 to 12.
- [Release notes](https://github.com/jenkinsci/pom/releases)
- [Changelog](https://github.com/jenkinsci/pom/blob/master/CHANGELOG.md)
- [Commits](https://github.com/jenkinsci/pom/commits)

Signed-off-by: dependabot[bot] <[email protected]>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

pom.xml

@@ -88,7 +88,7 @@
       <dependency>
         <groupId>io.jenkins.tools.bom</groupId>
         <artifactId>bom-2.176.x</artifactId>
-        <version>11</version>
+        <version>12</version>
         <scope>import</scope>
         <type>pom</type>
       </dependency>