chore(deps): update rust crate regex to 1.12.1 #837

Job	Run time
codespell	15s
cargo doc	1m 35s
cargo clippy	2m 1s
cargo fmt	15s
Unit, docs and onhost integration tests	8m 17s
ubuntu / stable / coverage	3m 36s
Unit test for embedded downloader	29s
tests as root	3m 54s
Build release binaries	5m 24s
K8s integration tests (part1)	12m 1s
K8s integration tests (part2)	10m 9s
cargo shear (unused dependencies)	12s
⚖️ Check third party licenses	4m 47s
k8s-e2e-tests / K8s e2e tests infra	11m 28s
K8s integration tests (flux-self-update)	10m 5s
security / Rust audit scanner	2m 43s
build-widows-binary	8m 8s
k8s-e2e-tests / K8s e2e tests	4s
🟢 All required checks and tests pass	4s
	1h 25m 27s

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