Update MAINTAINERS.md (#647) #1055

Job	Run time
examples / client (ubuntu-latest)	10s
examples / multirepo (ubuntu-latest)	8s
examples / client (macos-latest)	15s
examples / multirepo (macos-latest)	11s
examples / client (windows-latest)	38s
examples / multirepo (windows-latest)	1m 34s
examples / repository (ubuntu-latest)	9s
examples / root-signing (ubuntu-latest)	12s
examples / repository (macos-latest)	12s
examples / root-signing (macos-latest)	17s
examples / repository (windows-latest)	1m 46s
examples / root-signing (windows-latest)	1m 40s
examples / tuf-client-cli (ubuntu-latest)	14s
linting / golangci-lint	2m 33s
examples / tuf-client-cli (macos-latest)	19s
examples / tuf-client-cli (windows-latest)	1m 52s
linting / govulncheck	18s
tests / Run (ubuntu-latest)	29s
tests / Run (macos-latest)	38s
tests / Run (windows-latest)	1m 53s
	15m 28s

Provide feedback