Bump version to `0.14.2+ffmpeg.6.1` #337

Job	Run time
rustfmt_check (macos-latest)	22s
rustfmt_check (windows-latest)	33s
build_dynamic_and_test_windows_pre	5m 47s
docs_rs_check	56s
rustfmt_check (ubuntu-latest)	12s
build_static_and_test_ubuntu (release/4.3, nightly, no valgrind)	5m 34s
build_static_and_test_ubuntu (release/4.3, 1.70.0, no valgrind)	5m 47s
rust_clippy_check_ubuntu	5m 3s
rust_clippy_check_windows	27m 44s
build_static_and_test_ubuntu (release/5.0, nightly, no valgrind)	6m 1s
build_static_and_test_ubuntu (release/5.0, 1.70.0, no valgrind)	5m 23s
build_static_and_test_ubuntu (release/6.1, nightly, valgrind)	1h 3m 7s
build_static_and_test_ubuntu (release/6.1, nightly, no valgrind)	6m 6s
build_static_and_test_ubuntu (release/6.1, 1.70.0, no valgrind)	5m 25s
build_dynamic_and_test_windows (nightly)	2m 21s
build_dynamic_and_test_windows (1.70.0)	2m 2s
	2h 22m 23s

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