Fsdk/Process: fix QueuedLock thread safety #1638

Job	Run time
linux-newLTS-github--dotnet-and-xbuild	18s
linux-newLTS-vanilla--newmono	1m 22s
linux-newLTS-github--dotnet-and-msbuild	39s
linux-newLTS-vanilla--dotnet6	30s
linux-newLTS-vanilla--stockmono	56s
linux-oldLTS-github--dotnet-and-msbuild	36s
linux-oldLTS-github--dotnet-and-xbuild	24s
linux-oldLTS-vanilla--newmono	1m 17s
linux-oldLTS-vanilla--stockmono	47s
macOS--dotnet6-and-mono	32s
macOS--mono	24s
windows--dotnet6	50s
windows--legacyFramework	7m 46s
sanity-check	0s
publish	0s
	16m 21s

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