Update dependency io.quarkiverse.githubapp:quarkus-github-app to v2.8.4

Signed-off-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

java-components/pom.xml

@@ -72,7 +72,7 @@
         <!-- QuarkusGitHub extension uses same version as GitHubAPI -->
         <github-api.version>1.322</github-api.version>
         <quarkus-github-api.version>${github-api.version}.0</quarkus-github-api.version>
-        <quarkus-github-app.version>2.8.1</quarkus-github-app.version>
+        <quarkus-github-app.version>2.8.4</quarkus-github-app.version>
         <quarkus-quinoa.version>2.5.0</quarkus-quinoa.version>
 
         <format.skip>false</format.skip>