Remove codeowners #479

Job	Run time
CheckTargets	1m 35s
Docs	9s
Check (aarch64-apple-ios)	32s
Clippy	8s
Check (aarch64-apple-tvos)	33s
MinimalVersions (ubuntu-latest)	20s
Check (aarch64-unknown-openbsd)	30s
MSRV (ubuntu-latest)	13s
MinimalVersions (macos-latest)	34s
Check (arm64_32-apple-watchos)	32s
MSRV (macos-latest)	16s
Check (armv7-sony-vita-newlibeabihf)	30s
MinimalVersions (windows-latest)	52s
Nightly	18s
MSRV (windows-latest)	28s
Check (sparcv9-sun-solaris)	32s
Check (x86_64-pc-solaris)	33s
Rustfmt	10s
Sanitizer (address)	49s
Check (x86_64-unknown-dragonfly)	33s
Sanitizer (leak)	43s
Check (x86_64-unknown-openbsd)	29s
Sanitizer (memory)	1m 9s
Test (ubuntu-latest)	49s
TestPoll	37s
Test (macos-latest)	42s
Sanitizer (thread)	42s
TestWakerPipe	34s
Test (windows-latest)	1m 35s
Passed	2s
	17m 29s

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