Fix JSON formatting in graalvm25.json

Author: jackkke

bucket/graalvm25.json

@@ -15,7 +15,8 @@
         "GRAALVM_HOME": "$dir"
     },
     "checkver": {
-        "github": "graalvm/graalvm-ce-builds"
+        "github": "graalvm/graalvm-ce-builds",
+        "regex": "jdk-([\\d.]+)"
     },
     "autoupdate": {
         "url": "https://github.com/graalvm/graalvm-ce-builds/releases/download/jdk-$version/graalvm-community-jdk-$version_windows-x64_bin.zip",