[CI] Use JDK 25 Zulu build.

Author: vyazelenko

.github/workflows/ci.yml

@@ -32,7 +32,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        java: [ '17', '21', '24' ]
+        java: [ '17', '21', '25' ]
         os: [ 'ubuntu-24.04', 'windows-latest', 'macos-15' ]
     steps:
       - name: Checkout code

.github/workflows/slow.yml

@@ -33,7 +33,7 @@ jobs:
     timeout-minutes: 120
     strategy:
       matrix:
-        java: [ '21' ]
+        java: [ '25' ]
         dotnet: [ '8.0.x' ]
     env:
       DOTNET_SKIP_FIRST_TIME_EXPERIENCE: true