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Remove stabilized `const_mut_refs` feature #3217

Job	Run time
Check Formatting	11s
kani	41s
Clippy	13s
Bootloader Integration Test (ubuntu-latest)	53s
Bootloader Integration Test (macos-latest)	2m 32s
Semver Checks	3m 49s
Test MSRV and Stable Features (nightly)	17s
Test (ubuntu-latest)	29s
Bootloader Integration Test (windows-latest)	2m 24s
Test (macos-12)	40s
Test MSRV and Stable Features (1.59)	31s
Test (macos-latest)	31s
Test (windows-latest)	38s
	13m 49s

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