Specify branch for GitHub Actions badge and fix link #2835

Job	Run time
features_check (ubuntu-latest)	5m 45s
rust_msrv (ubuntu-latest)	51s
features_check (macos-latest)	17m 54s
rust_versions (ubuntu-latest, stable)	1m 6s
features_check (windows-latest)	9m 49s
rust_versions (ubuntu-latest, beta)	1m 3s
rust_versions (ubuntu-latest, nightly)	1m 10s
timezones (ubuntu-latest, ACST-9:30)	1m 14s
alternative_targets (ubuntu-latest, wasm32-unknown-emscripten)	15s
alternative_targets (ubuntu-latest, aarch64-apple-ios)	10s
timezones (ubuntu-latest, EST4)	1m 12s
alternative_targets (ubuntu-latest, aarch64-linux-android)	17s
check-docs	23s
timezones (ubuntu-latest, UTC0)	1m 13s
timezones (ubuntu-latest, Asia/Katmandu)	1m 25s
cross-targets (x86_64-sun-solaris)	1m 7s
cross-tests (ubuntu-latest)	1m 47s
timezones (macos-latest, ACST-9:30)	58s
timezones (macos-latest, EST4)	1m 4s
timezones (macos-latest, UTC0)	49s
no_std (ubuntu-latest, thumbv6m-none-eabi)	14s
test_wasi (ubuntu-latest, wasm32-wasi)	24s
timezones (macos-latest, Asia/Katmandu)	40s
no_std (ubuntu-latest, x86_64-fortanix-unknown-sgx)	9s
timezones (windows-latest, ACST-9:30)	1m 55s
timezones (windows-latest, EST4)	2m 20s
test_wasm (ubuntu-latest)	14s
timezones (windows-latest, UTC0)	2m 11s
timezones (windows-latest, Asia/Katmandu)	1m 28s
	59m 7s

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