CI: Clean Gradle/Java cache

[mmathieum]

Links:

• https://github.com/gradle/actions/
• https://github.com/actions/setup-java

Changes:

• Use gradle/actions/setup-gradle instead of manual process #23
• Use gradle/actions/setup-gradle instead of manual process commons-android#15
• Use gradle/actions/setup-gradle instead of manual process parser#6
• Use gradle/actions/setup-gradle instead of manual process commons-java#1
• Use gradle/actions/setup-gradle instead of manual process commons#344