feat: compiles over Jdk17 with multiarch based images

[ghost]

This PR contributes changes in the build system to compile against JDK17

Description

In the Apache OpenServerless (incubating) project we rely on OpenWhisk provided images and we aim to be able to use multi arch images for OpenWhisk and build a native executable of the standalone flavour.

This PR introduce these changes:

• switch to gradle 7.6.2
• Upgrade JDK building version to JDK17-temurin
• Upgrade Dockerfile base image to JRE21-temurin which is multiarch
• Updated various build plugin to guarantee compatibility with gradle 7.6.2

Related issue and scope

• I opened an issue to propose and discuss this change

A brief discussion for JDK17 support has been opened here

My changes affect the following components

• API
• Controller
• Message Bus (e.g., Kafka)
• Loadbalancer
• Scheduler
• Invoker
• Intrinsic actions (e.g., sequences, conductors)
• Data stores (e.g., CouchDB)
• [X ] Tests
• [ X] Deployment
• CLI
• General tooling
• Documentation

Types of changes

• Bug fix (generally a non-breaking change which closes an issue).
• [ X] Enhancement or new feature (adds new functionality).
• Breaking change (a bug fix or enhancement which changes existing behavior).

Checklist:

• [ X] I signed an Apache CLA.
• [ X] I reviewed the style guides and followed the recommendations (Travis CI will check :).
• I added tests to cover my changes.
• My changes require further changes to the documentation.
• I updated the documentation where necessary.

[dgrove-oss]

lgtm -- thanks for pushing this forward!