Improve precision of float `multiple_of` validation #4824

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	3m 7s
build-wasm-emscripten	2m 46s
build sdist	16s
coverage	3m 4s
lint	49s
test MSRV	2m 44s
test-debug 3.11	1m 20s
test on ubuntu	2m 25s
test-pydantic-integration	1m 27s
test-debug pypy3.10	1m 20s
test on macos	2m 54s
test 3.8	2m 15s
test on windows	4m 57s
test 3.9	2m 21s
test 3.10	2m 23s
test 3.11	2m 32s
test 3.12	2m 28s
test 3.13	2m 59s
test pypy3.9	2m 43s
test pypy3.10	2m 52s
test build on ${{ matrix.os }}	0s
test build on ${{ matrix.target }}-${{ matrix.distro }}	0s
inspect-pypi-assets	0s
check	8s
release	0s
	47m 50s

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