Bump gradle-wrapper from 8.6 to 9.5.0 in /app-backend

Bumps [gradle-wrapper](https://github.com/gradle/gradle) from 8.6 to 9.5.0.
- [Release notes](https://github.com/gradle/gradle/releases)
- [Commits](gradle/gradle@v8.6.0...v9.5.0)

---
updated-dependencies:
- dependency-name: gradle-wrapper
  dependency-version: 9.5.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

app-backend/gradle/wrapper/gradle-wrapper.jar

@@ -1,5 +1,8 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.6-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-9.5.0-bin.zip
+networkTimeout=10000
+retries=0
+retryBackOffMs=500
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists