Update README.md for GraalVM 25.

Author: fniephaus

README.md

@@ -29,7 +29,7 @@ jobs:
       - uses: actions/checkout@v4
       - uses: graalvm/setup-graalvm@v1
         with:
-          java-version: '21'      # See 'Options' for more details
+          java-version: '25'      # See 'Options' for more details
           distribution: 'graalvm' # See 'Supported distributions' for available options
           github-token: ${{ secrets.GITHUB_TOKEN }}
       - name: Example step
@@ -61,7 +61,7 @@ jobs:
 
       - uses: graalvm/setup-graalvm@v1
         with:
-          java-version: '21'
+          java-version: '25'
           distribution: 'graalvm'
           github-token: ${{ secrets.GITHUB_TOKEN }}
           native-image-job-reports: 'true'
@@ -92,7 +92,7 @@ jobs:
       - uses: actions/checkout@v4
       - uses: graalvm/setup-graalvm@v1
         with:
-          java-version: '24-ea' # or 'latest-ea' for the latest Java version available
+          java-version: '26-ea' # or 'latest-ea' for the latest Java version available
           distribution: 'graalvm'
           github-token: ${{ secrets.GITHUB_TOKEN }}
 ```
@@ -194,7 +194,7 @@ This actions can be configured with the following options:
 
 | Name            | Default  | Description |
 |-----------------|:--------:|-------------|
-| `java-version`<br>*(required)* | n/a | Java version <ul><li>major versions: `'24'`, `'21'`, `'17'`, `'11'`, `'8'`</li><li>specific versions: `'21.0.3'`, `'17.0.11'`</li><li>early access (EA) builds: `'25-ea'` *(requires `distribution: 'graalvm'`)*</li><li>latest EA build: `'latest-ea'` *(requires `distribution: 'graalvm'`)*</li><li>dev builds: `'dev'`</li></ul> |
+| `java-version`<br>*(required)* | n/a | Java version <ul><li>major versions: `'25'`, `'21'`, `'17'`, `'11'`, `'8'`</li><li>specific versions: `'21.0.3'`, `'17.0.11'`</li><li>early access (EA) builds: `'26-ea'` *(requires `distribution: 'graalvm'`)*</li><li>latest EA build: `'latest-ea'` *(requires `distribution: 'graalvm'`)*</li><li>dev builds: `'dev'`</li></ul> |
 | `distribution`  | `'graalvm'` | GraalVM distribution (see [supported distributions](#supported-distributions)) |
 | `java-package`  | `'jdk'` | The package type (`'jdk'` or `'jdk+fx'`). Currently applies to Liberica only. |
 | `github-token`  | `'${{ github.token }}'` | Token for communication with the GitHub API. Please set this to `${{ secrets.GITHUB_TOKEN }}` (see [templates](#templates)) to allow the action to authenticate with the GitHub API, which helps reduce rate-limiting issues. |