Workflow: New arba version

Sur la branche develop:

• In CMakeLists.txt, update VERSION project.
• In example/basic_cmake_project/CMakeLists.txt, update find_package arba VERSION.
• Commit changes with message "vVERSION: Start version VERSION".
• Do more commits, like updating submodules versions.
• Update README.md.
• Push develop branch.
• Use git-flow to start a release.
• Push release/X.Y branch.
• Use git-flow to finish release (delete branch).
• Push main branch.
• Push release-X.Y tag.
• Go back to develop branch