guess_language: add flake.lock as json #3184

Job	Run time
Actionlint	1m 2s
Rustfmt	1m 7s
Test x86_64-unknown-linux-gnu	3m 41s
Check Linux Packaging	3m 45s
Output Regression Test	4m 8s
Test x86_64-apple-darwin	4m 40s
Test Linux (latest stable Rust)	2m 0s
Test x86_64-pc-windows-msvc	4m 27s
Test with MIME database	3m 41s
Test aarch64-unknown-linux-gnu	5m 14s
Test aarch64-apple-darwin	3m 55s
Test x86_64-unknown-linux-musl	4m 0s
	41m 40s

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