Bump Gradle version

Author: ascheman

gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,6 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.11.1-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.12.1-bin.zip
 networkTimeout=10000
 validateDistributionUrl=true
 zipStoreBase=GRADLE_USER_HOME

htmlSanityCheck-gradle-plugin/src/test/groovy/org/aim42/htmlsanitycheck/gradle/HtmlSanityCheckTaskFunctionalSpec.groovy

@@ -31,8 +31,8 @@ class HtmlSanityCheckTaskFunctionalSpec extends HtmlSanityCheckBaseSpec {
             // 6.x or older does not work!
             '7.6.3', // latest 7.x
             '8.0.2', '8.1.1', '8.2.1', '8.3', '8.4',
-            '8.5', '8.6', '8.7', '8.8', '8.9', '8.10.2',
-            '8.11.1' // all 8.x minor versions (latest patch release)
+            '8.5', '8.6', '8.7', '8.8', '8.9', '8.10.2', '8.11.1',
+            '8.12.1'  // all 8.x minor versions (latest patch release)
             // end::tested-gradle-versions[]
     ])