Bump DavidAnson/markdownlint-cli2-action from 18.0.0 to 19.0.0 #1799

Job	Run time
build-nuget-package	2m 44s
build (windows-2022, /c/ProgramData/OpenTelemetry .NET AutoInstrumentation/logs)	5m 12s
container-build (ubuntu-20.04, alpine-x64, linux-musl)	21s
build (ubuntu-20.04, /var/log/opentelemetry/dotnet)	3m 42s
container-build (self-hosted, Linux, ARM64, alpine-arm64, linux-musl)	1m 34s
build (macos-13, /var/log/opentelemetry/dotnet)	4m 24s
container-build (self-hosted, Linux, ARM64, debian-arm64, linux-glibc)	1m 16s
test-nuget-package (ubuntu-20.04)	1m 6s
test-nuget-package (macos-13)	1m 59s
Create GitHub release	0s
	22m 18s

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