chore(deps): update gradle docker tag (#14)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| gradle | minor | `8.4.0-jdk17` -> `8.5.0-jdk17` |
| [gradle](https://gradle.org) ([source](https://github.com/gradle/gradle)) | minor | `8.4` -> `8.5` |

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Reviewed-on: #14

.woodpecker/.backend.yml

@@ -1,6 +1,6 @@
 ---
 variables:
-  - &java_image "gradle:8.4.0-jdk17"
+  - &java_image "gradle:8.5.0-jdk17"
 when:
   path: "app/**"
 clone:

gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,6 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.4-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.5-bin.zip
 networkTimeout=10000
 validateDistributionUrl=true
 zipStoreBase=GRADLE_USER_HOME