remove all functionality deprecated in 0.19 #7372

Job	Run time
test-debug	9m 13s
fmt	28s
emscripten	0s
check-msrv	10m 59s
semver-checks	34s
python${{ matrix.python-version }}-${{ matrix.platform.python-architecture }} ${{ matrix.platform.os }} rust-${{ matrix.rust }}	0s
careful	0s
clippy/x86_64-apple-darwin/stable	19m 28s
coverage-windows	6s
clippy/x86_64-unknown-linux-gnu/stable	8m 47s
coverage-macos	5s
clippy/powerpc64le-unknown-linux-gnu/stable	7m 56s
valgrind	0s
coverage-ubuntu	14m 5s
clippy/s390x-unknown-linux-gnu/stable	7m 54s
clippy/wasm32-wasi/stable	7m 28s
clippy/x86_64-pc-windows-msvc/stable	12m 57s
clippy/i686-pc-windows-msvc/stable	11m 34s
python3.12-x64 ubuntu-latest rust-stable / build	7m 46s
python3.12-x64 windows-latest rust-stable / build	11m 38s
python3.12-x86 windows-latest rust-stable / build	7m 49s
python3.12-x64 macos-latest rust-stable / build	11m 3s
python3.12-x64 ubuntu-latest rust-nightly / build	7m 34s
conclusion	1s
	2h 37m 25s

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