Bump serde from 1.0.204 to 1.0.209 #4993

Job	Run time
build pgo-optimized on ${{ matrix.os }} / ${{ matrix.interpreter }}	0s
build on ${{ matrix.os }} (${{ matrix.target }} - ${{ matrix.interpreter \|\| 'all' }}${{ (((matrix.os == 'linux') && format(' - {0}', (((matrix.manylinux == 'auto') && 'manylinux') \|\| matrix.manylinux))) \|\| '') }})	0s
rust benchmarks	2m 58s
build sdist	14s
build-wasm-emscripten	2m 26s
coverage	2m 57s
lint	1m 15s
test-debug 3.11	54s
test MSRV	3m 7s
test-debug pypy3.10	1m 16s
test on ubuntu	2m 42s
test on macos	2m 7s
test-pydantic-integration	1m 35s
test on windows	5m 57s
test 3.8	2m 35s
test 3.9	2m 27s
test 3.10	2m 41s
test 3.11	2m 24s
test 3.12	2m 30s
test 3.13	2m 35s
test pypy3.9	2m 43s
test pypy3.10	2m 52s
test build on ${{ matrix.target }}-${{ matrix.distro }}	0s
test build on ${{ matrix.os }}	0s
inspect-pypi-assets	0s
check	1s
release	0s
	48m 16s

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