Remove the `BoundObject` impl for `&Bound`, use `Borrowed` instead #10996

Job	Run time
fmt	11s
resolve	3s
check-msrv	10m 42s
semver-checks	20s
python${{ matrix.python-version }}-${{ matrix.platform.python-architecture }} ${{ matrix.platform.os }} rust-${{ matrix.rust }}	0s
careful	0s
coverage windows-latest	5s
coverage macos-14	7s
clippy/aarch64-apple-darwin/stable	8m 22s
coverage ubuntu-latest	11m 1s
docsrs	0s
clippy/x86_64-unknown-linux-gnu/stable	14m 42s
emscripten	0s
clippy/powerpc64le-unknown-linux-gnu/stable	13m 12s
clippy/s390x-unknown-linux-gnu/stable	13m 8s
valgrind	0s
clippy/wasm32-wasi/stable	12m 52s
test-debug	0s
clippy/x86_64-pc-windows-msvc/stable	17m 34s
clippy/i686-pc-windows-msvc/stable	17m 9s
test-free-threaded	0s
clippy/x86_64-unknown-linux-gnu/beta	13m 50s
test-version-limits	0s
check-feature-powerset ${{ matrix.rust }}	0s
test-cross-compilation ${{ matrix.os }} -> ${{ matrix.target }}	0s
test-cross-compilation-windows	0s
python3.12-x64 ubuntu-latest rust-nightly / build	5m 56s
python3.12-x64 macos-13 rust-stable / build	13m 0s
python3.12-arm64 macos-14 rust-stable / build	6m 32s
python3.12-x64 ubuntu-latest rust-stable / build	9m 20s
python3.12-x86 windows-latest rust-stable / build	10m 17s
python3.12-x64 windows-latest rust-stable / build	14m 24s
conclusion	1s
	3h 12m 48s

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