chore(deps): bump gradle-wrapper from 7.6.1 to 9.3.0 in /backend

Bumps gradle-wrapper from 7.6.1 to 9.3.0.

---
updated-dependencies:
- dependency-name: gradle-wrapper
  dependency-version: 9.3.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

backend/gradle/wrapper/gradle-wrapper.jar

@@ -1,5 +1,6 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-7.6.1-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-9.3.0-bin.zip
+networkTimeout=10000
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists