Migrate from JDK 8 to JDK 17

[Copilot]

Updates project to target JDK 17 as the minimum required Java version.

Changes

• pom.xml: Updated maven.compiler.source and maven.compiler.target from 8 to 17
• pom.xml: Updated maven-enforcer-plugin to require Java 17 (previously 1.8.0)
• .github/dependabot.yml: Removed JDK 8-specific checkstyle version constraint

All existing code and dependencies are compatible with JDK 17 without modification.

Original prompt

Migration to JDK 17

Migrate the htmlunit-cssparser project from JDK 8 to JDK 17.

Changes Required

1. Update pom.xml:

   • Change maven.compiler.source from 8 to 17 (line 20)
   • Change maven.compiler.target from 8 to 17 (line 21)
   • Update the maven-enforcer-plugin configuration to require Java 17 instead of 1.8.0 (line 63)

2. Update GitHub Actions workflows (if any):

   • Check .github/workflows/ directory for any workflow files that specify Java versions
   • Update any Java setup actions to use Java 17

3. Review code compatibility:

   • Ensure all code is compatible with JDK 17
   • Check for any deprecated APIs that need to be updated
   • Verify that all dependencies are compatible with JDK 17

Specific File Changes

pom.xml (lines 20-21):

<maven.compiler.source>17</maven.compiler.source>
<maven.compiler.target>17</maven.compiler.target>

pom.xml (lines 62-64):

<requireJavaVersion>
    <version>17</version>
</requireJavaVersion>

Testing Requirements

• Ensure all tests pass with JDK 17
• Verify that the build completes successfully
• Check that generated artifacts work correctly with JDK 17

This pull request was created from Copilot chat.

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