chore(deps): update gradle to v9 (#438)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [gradle](https://gradle.org) ([source](https://github.com/gradle/gradle)) | major | `8.14.5` → `9.5.1` |

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Reviewed-on: https://codeberg.org/guettli/sharedinbox/pulls/438

android/gradle/wrapper/gradle-wrapper.properties

@@ -2,4 +2,4 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.14.5-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-9.5.1-all.zip