Bump mhils/workflows from 18 to 19 in the dependencies group #1410

Job	Run time
build-macos-app	9s
build mitmproxy-rs (macos-universal)	2m 42s
build mitmproxy-rs (linux-arm64)	2m 21s
build mitmproxy-linux-x86_64	1m 16s
test (macos-latest, 1.85, --exclude mitmproxy-linux-ebpf)	48s
test (ubuntu-latest, nightly, --package mitmproxy-linux-ebpf)	1m 57s
build mitmproxy-linux-arm64	1m 50s
test (ubuntu-22.04, 1.85, --exclude mitmproxy-linux-ebpf)	1m 35s
build mitmproxy-rs (windows-x86_64)	5m 24s
build mitmproxy-rs (linux-x86_64)	5m 12s
test (windows-latest, 1.85, --exclude mitmproxy-linux-ebpf)	2m 58s
test (ubuntu-latest, stable, --exclude mitmproxy-linux-ebpf)	1m 13s
build mitmproxy-windows	3m 25s
build mitmproxy-macos	30s
test-linux-wheel-sdist	1m 59s
check / check	5s
deploy	0s
	33m 24s

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