Upgrade to JDK 21.0.8.

Author: fniephaus

.github/workflows/graalpy-micronaut-guide.yml

@@ -22,7 +22,7 @@ jobs:
       - uses: actions/checkout@v4
       - uses: graalvm/setup-graalvm@v1
         with:
-          java-version: '21.0.6'
+          java-version: '21.0.8'
           distribution: 'graalvm'
           github-token: ${{ secrets.GITHUB_TOKEN }}
           cache: 'maven'
@@ -62,7 +62,7 @@ jobs:
       - uses: actions/checkout@v4
       - uses: graalvm/setup-graalvm@v1
         with:
-          java-version: '21.0.6'
+          java-version: '21.0.8'
           distribution: 'graalvm'
           github-token: ${{ secrets.GITHUB_TOKEN }}
           cache: 'gradle'

.github/workflows/graalpy-micronaut-multithreaded.yml

@@ -22,7 +22,7 @@ jobs:
       - uses: actions/checkout@v4
       - uses: graalvm/setup-graalvm@v1
         with:
-          java-version: '21.0.6'
+          java-version: '21.0.8'
           distribution: 'graalvm'
           github-token: ${{ secrets.GITHUB_TOKEN }}
           cache: 'maven'
@@ -64,7 +64,7 @@ jobs:
       - uses: actions/checkout@v4
       - uses: graalvm/setup-graalvm@v1
         with:
-          java-version: '21.0.6'
+          java-version: '21.0.8'
           distribution: 'graalvm'
           github-token: ${{ secrets.GITHUB_TOKEN }}
           cache: 'gradle'

.github/workflows/graalpy-spring-boot-guide.yml

@@ -22,7 +22,7 @@ jobs:
       - uses: actions/checkout@v4
       - uses: graalvm/setup-graalvm@v1
         with:
-          java-version: '21.0.6'
+          java-version: '21.0.8'
           distribution: 'graalvm'
           github-token: ${{ secrets.GITHUB_TOKEN }}
           cache: 'maven'
@@ -62,7 +62,7 @@ jobs:
       - uses: actions/checkout@v4
       - uses: graalvm/setup-graalvm@v1
         with:
-          java-version: '21.0.6'
+          java-version: '21.0.8'
           distribution: 'graalvm'
           github-token: ${{ secrets.GITHUB_TOKEN }}
           cache: 'gradle'