Bump Gradle -> 9.7.1

[alexander-yevsyukov]

Updates the Gradle wrapper from 9.6.1 to 9.7.1, the current release per the
official release notes.

Changes

• gradle/wrapper/gradle-wrapper.properties — distributionUrl bumped to gradle-9.7.1-bin.zip
• gradle/wrapper/gradle-wrapper.jar — regenerated by the 9.7.1 distribution

gradlew and gradlew.bat are byte-identical between 9.6.1 and 9.7.1, so they
are intentionally absent from this diff.

Provenance

The committed wrapper JAR matches Gradle's published checksum
for 9.7.1:

7a9ce74cff467ca1bf60a4fcd9f05185acceda4d0f382434d393e17864262c5d

Verification

Both run on 9.7.1 with JDK 17 (matching BuildSettings.jvmTarget):

• ./gradlew clean detekt — BUILD SUCCESSFUL (the command this repo's CI runs)
• buildSrc build — BUILD SUCCESSFUL, with :test and :validatePlugins executed

The root project has no build task, so detekt plus the buildSrc build is the
full check surface here.

🤖 Generated with Claude Code