refactor: rename UnderPressureOptions into FastifyUnderPressureOptions #465

Job	Run time
test / Test (18, macos-latest)	1m 17s
test / Test (18, ubuntu-latest)	1m 16s
test / Dependency Review	3s
test / Test Fastify Integration	0s
test / Test (18, windows-latest)	1m 58s
test / Check Licenses	29s
test / Test (20, macos-latest)	1m 12s
test / Test (20, ubuntu-latest)	1m 8s
test / Lint Code	28s
test / Test (20, windows-latest)	1m 54s
test / Test (21, macos-latest)	1m 14s
test / Test (21, ubuntu-latest)	1m 12s
test / Test (21, windows-latest)	1m 40s
test / Automerge Dependabot PRs	0s
	13m 51s

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