Add branch and circleci config file to the circleci cache key

[jonatan-ivanov]

We can get into issues because of the circleci cache does not get invalidated when there are changes in the .circleci/config.yml (e.g.: Java version).
See:

• Add circleci config file to the circleci cache key micrometer#3611
• Use branch in every cache key micrometer#3889
• Use branch name in dependencies cache key for CircleCI micrometer#2975