Limit overrides and constraints to `requirements.txt` format (#2632) #5

Job	Run time
check windows trampoline	3m 48s
build binary \| macos x86_64	1s
build binary \| windows	1s
build binary \| macos aarch64	1m 35s
cargo clippy (ubuntu-latest)	1m 21s
cargo clippy (windows-latest)	5m 24s
cargo test \| ubuntu	1s
build binary \| linux	1s
cargo fmt	32s
cargo test \| windows	1s
cargo test \| macos	4m 1s
check system \| python on macos x86_64	0s
check system \| python on macos aarch64	33s
check system \| python3.10 on windows	0s
check system \| python3.12 via chocolatey	0s
check system \| python3.13 on windows	0s
check system \| python on centos	0s
check system \| python on debian	0s
check system \| python on fedora	0s
check system \| pypy on ubuntu	0s
check system \| pyston	0s
check system \| python on ubuntu	0s
check system \| alpine	0s
check system \| amazonlinux	0s
check system \| conda${{ matrix.python-version }} on ${{ matrix.os }}	0s
check system \| python via pyenv	0s
	17m 19s

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