workflows: use fastify/workflows and pin versions #311

Job	Run time
test / Dependency Review	4s
test / Test Fastify Integration	0s
test / Lint Code	37s
test / Check Licenses	40s
test / Test (16, macos-latest)	1m 8s
test / Test (16, ubuntu-latest)	39s
test / Test (16, windows-latest)	1m 19s
test / Test (18, macos-latest)	1m 4s
test / Test (18, ubuntu-latest)	44s
test / Test (18, windows-latest)	1m 31s
test / Test (20, macos-latest)	1m 16s
test / Test (20, ubuntu-latest)	46s
test / Test (20, windows-latest)	1m 26s
test / Automerge Dependabot PRs	0s
	11m 14s

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