Auto-update Java version used in tests (open-telemetry#2097)

Author: trask

.github/renovate.json5

@@ -6,6 +6,7 @@
   ],
   ignorePresets: [
     ':ignoreModulesAndTests', // needed to keep maven-extension test pom files up-to-date
+    'workarounds:javaLTSVersions', // Allow all Java major versions, not just LTS
   ],
   prHourlyLimit: 5, // we have a large number of parallel runners
   labels: [
@@ -170,11 +171,22 @@
       customType: 'regex',
       datasourceTemplate: 'npm',
       managerFilePatterns: [
-        '/^.github/workflows//',
+        '.github/workflows/**'
       ],
       matchStrings: [
         'npx (?<depName>[^@]+)@(?<currentValue>[^\\s]+)',
       ],
     },
+    {
+      customType: 'regex',
+      datasourceTemplate: 'java-version',
+      managerFilePatterns: [
+        '.github/workflows/**'
+      ],
+      matchStrings: [
+        '(?<currentValue>\\d+) # renovate: datasource=java-version',
+      ],
+      depNameTemplate: 'java',
+    },
   ],
 }

.github/workflows/build.yml

@@ -54,7 +54,7 @@ jobs:
           - 11
           - 17
           - 21
-          - 23
+          - 23 # renovate: datasource=java-version
         # macos-latest drops support for java 8 temurin. Run java 8 on macos-13. Run java 11, 17, 21 on macos-latest.
         exclude:
           - os: macos-latest
@@ -66,7 +66,7 @@ jobs:
           - os: macos-13
             test-java-version: 21
           - os: macos-13
-            test-java-version: 23
+            test-java-version: 23 # renovate: datasource=java-version
     steps:
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2