Upgrade Gradle wrapper to version 8.8.

- `dirMode` -> `dirPermissions`, `fileMode` -> `filePermissions`: The CopyProcessingSpec.setDirMode(Integer)/.setFileMode(Integer) method has been deprecated. This is scheduled to be removed in Gradle 9.0. Please use the dirPermissions(Action)/filePermissions(Action) method instead. Consult the upgrading guide for further information: https://docs.gradle.org/8.8/userguide/upgrading_version_8.html#unix_file_permissions_deprecated

gradle/wrapper/gradle-wrapper.properties

@@ -1,7 +1,7 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionSha256Sum=544c35d6bd849ae8a5ed0bcea39ba677dc40f49df7d1835561582da2009b961d
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.7-bin.zip
+distributionSha256Sum=a4b4158601f8636cdeeab09bd76afb640030bb5b144aafe261a5e8af027dc612
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.8-bin.zip
 networkTimeout=10000
 validateDistributionUrl=true
 zipStoreBase=GRADLE_USER_HOME

metafacture-runner/build.gradle

@@ -107,8 +107,8 @@ distributions {
   main {
     distributionBaseName = parent.project.name
     contents {
-      dirMode = 0755
-      fileMode = 0644
+      dirPermissions { unix 0755 }
+      filePermissions { unix 0644 }
 
       into('lib/') {
         from jar
@@ -120,7 +120,7 @@ distributions {
       from('src/main/scripts') {
         filter(ReplaceTokens, tokens: [jarfile: 'lib/' + jar.archiveFileName.get() ])
         filteringCharset = 'UTF-8'
-        fileMode = 0755
+        filePermissions { unix 0755 }
       }
       from('../') {
         include 'LICENSE'