Bump jetty.version from 12.0.5 to 12.0.8

Bumps `jetty.version` from 12.0.5 to 12.0.8.

Updates `org.eclipse.jetty:jetty-server` from 12.0.5 to 12.0.8

Updates `org.eclipse.jetty:jetty-util` from 12.0.5 to 12.0.8

Updates `org.eclipse.jetty:jetty-http` from 12.0.5 to 12.0.8

---
updated-dependencies:
- dependency-name: org.eclipse.jetty:jetty-server
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: org.eclipse.jetty:jetty-util
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: org.eclipse.jetty:jetty-http
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

pom.xml

@@ -30,7 +30,7 @@
     <io7m.api.previousVersion>1.0.0</io7m.api.previousVersion>
     <io7m.java.targetJavaVersion>21</io7m.java.targetJavaVersion>
     <jackson.version>2.16.1</jackson.version>
-    <jetty.version>12.0.5</jetty.version>
+    <jetty.version>12.0.8</jetty.version>
     <junit.version>5.10.1</junit.version>
     <org.immutables.version>2.10.0</org.immutables.version>
   </properties>