ci: remove master branch support #42

Job	Run time
test / Dependency Review	6s
test / Lint Code	22s
test / Test Fastify Integration	0s
test / Check Licenses	23s
test / Test (18, macos-latest)	41s
test / Test (18, ubuntu-latest)	30s
test / Test (18, windows-latest)	53s
test / Test (20, macos-latest)	33s
test / Test (20, ubuntu-latest)	28s
test / Test (20, windows-latest)	1m 15s
test / Test (22, macos-latest)	33s
test / Test (22, ubuntu-latest)	26s
test / Test (22, windows-latest)	1m 23s
test / Automerge Dependabot PRs	0s
	7m 33s

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