Use setup-java action for jruby tests

Author: ntkme

.github/workflows/build.yml

@@ -40,7 +40,7 @@ jobs:
           - macos-latest
           - ubuntu-latest
           - ubuntu-24.04-arm
-          - windows-2025
+          - windows-latest
         container:
           -
         vm:
@@ -54,9 +54,9 @@ jobs:
           - truffleruby
           - truffleruby+graalvm
         exclude:
-          - os: windows-2025
+          - os: windows-latest
             ruby-version: truffleruby
-          - os: windows-2025
+          - os: windows-latest
             ruby-version: truffleruby+graalvm
         include:
           - os: ubuntu-latest
@@ -156,6 +156,13 @@ jobs:
         if: endsWith(matrix.container.image, ':alpine') || endsWith(matrix.container.image, '-alpine')
         run: apk add build-base
 
+      - name: Setup java
+        if: matrix.ruby-version == 'jruby'
+        uses: actions/setup-java@v4
+        with:
+          distribution: temurin
+          java-version: 21
+
       - name: Setup ruby
         if: matrix.ruby-version
         uses: ruby/setup-ruby@v1

.github/workflows/schedule.yml

@@ -16,22 +16,29 @@ jobs:
         os:
           - macos-latest
           - ubuntu-latest
-          - windows-2025
+          - windows-latest
         ruby-version:
           - ruby-head
           - jruby-head
           - truffleruby-head
           - truffleruby+graalvm-head
         exclude:
-          - os: windows-2025
+          - os: windows-latest
             ruby-version: truffleruby-head
-          - os: windows-2025
+          - os: windows-latest
             ruby-version: truffleruby+graalvm-head
 
     steps:
       - name: Checkout
         uses: actions/checkout@v4
 
+      - name: Setup java
+        if: matrix.ruby-version == 'jruby-head'
+        uses: actions/setup-java@v4
+        with:
+          distribution: temurin
+          java-version: 21
+
       - name: Setup ruby
         uses: ruby/setup-ruby@v1
         with: