Update pipeline code

[brinxmat]

• use Java 17
• use actions/setup-java@v3 with gradle cache
• use actions/checkout@v3
• removes cache action since with is called by the java action
• removes unused directives (install jq)
• removes unnecessary chmod of gradlew

[anetteOlli]

Trengs ikke det å sette java versjon i gradle også?

[hackon]

Do we need to update more things too?
Like: jitpack?