Stop using deprecated macos-12 runner #3289

Job	Run time
Check Linux Packaging	4m 20s
Test Linux (latest stable Rust)	2m 19s
Output Regression Test	4m 42s
Test x86_64-unknown-linux-gnu	4m 18s
Test with MIME database	3m 54s
Test x86_64-pc-windows-msvc	5m 0s
Actionlint	1m 0s
Test aarch64-unknown-linux-gnu	5m 43s
Rustfmt	1m 25s
Test x86_64-apple-darwin	1s
Test aarch64-apple-darwin	4m 27s
Test x86_64-unknown-linux-musl	4m 30s
	41m 39s

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