v13

 * Bump buildbot to v3.11.1 release
 * Revert "buildmaster: fix Twisted dependency hell by using twisted==22.10.0"
 * phase1,phase2: s/master/main for phase{1,2}
 * phase2: fix relative paths for scripts and files
 * requirements-dev: use black 23.12.1 and ruff 0.1.9
 * phase2: fix invalid escape sequence flake8 warning in checksums step
 * phase2: checksums: split long command line
 * Add linting with flake8 tool
 * phase2: fix stray closing parenthesis
 * phase2: dlsha2rsyncpl: fix sha2rsync.pl script location
 * phase2: update default sdk pattern to a more relaxed pattern
 * CI(deps): Bump docker/login-action from 2 to 3
 * CI(deps): Bump docker/build-push-action from 4 to 5
 * CI(deps): Bump docker/metadata-action from 4 to 5
 * CI(deps): Bump actions/setup-python from 4 to 5
 * CI(deps): Bump actions/checkout from 3 to 4
 * CI: add dependabot scan
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