Bump jetty.version from 12.1.0.alpha1 to 12.1.0.alpha2

Bumps `jetty.version` from 12.1.0.alpha1 to 12.1.0.alpha2.

Updates `org.eclipse.jetty:jetty-bom` from 12.1.0.alpha1 to 12.1.0.alpha2
- [Release notes](https://github.com/jetty/jetty.project/releases)
- [Commits](jetty/jetty.project@jetty-12.1.0.alpha1...jetty-12.1.0.alpha2)

Updates `org.eclipse.jetty.ee11:jetty-ee11-bom` from 12.1.0.alpha1 to 12.1.0.alpha2
- [Release notes](https://github.com/jetty/jetty.project/releases)
- [Commits](jetty/jetty.project@jetty-12.1.0.alpha1...jetty-12.1.0.alpha2)

---
updated-dependencies:
- dependency-name: org.eclipse.jetty:jetty-bom
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: org.eclipse.jetty.ee11:jetty-ee11-bom
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

pom.xml

@@ -19,7 +19,7 @@
     <arquillian.core.version>1.9.3.Final</arquillian.core.version>
     <arquillian.jetty.version>2.0.1.Final-SNAPSHOT</arquillian.jetty.version>
     <arquillian.jetty.artifactId>arquillian-jetty-embedded-12-ee11</arquillian.jetty.artifactId>
-    <jetty.version>12.1.0.alpha1</jetty.version> <!-- 11.0.9-SNAPSHOT -->
+    <jetty.version>12.1.0.alpha2</jetty.version> <!-- 11.0.9-SNAPSHOT -->
     <surefire.version>3.5.2</surefire.version>
     <fork.argLine>-Xmx8g -Xms4g</fork.argLine>
     <http2.timeout></http2.timeout>