Update branch names in pull request template #2836

Job	Run time
features_check (ubuntu-latest)	5m 28s
rust_msrv (ubuntu-latest)	50s
features_check (macos-latest)	17m 43s
timezones (ubuntu-latest, ACST-9:30)	1m 15s
features_check (windows-latest)	9m 25s
timezones (ubuntu-latest, EST4)	1m 19s
timezones (ubuntu-latest, UTC0)	1m 19s
timezones (ubuntu-latest, Asia/Katmandu)	1m 12s
alternative_targets (ubuntu-latest, wasm32-unknown-emscripten)	24s
timezones (macos-latest, ACST-9:30)	51s
alternative_targets (ubuntu-latest, aarch64-apple-ios)	9s
timezones (macos-latest, EST4)	1m 26s
alternative_targets (ubuntu-latest, aarch64-linux-android)	11s
timezones (macos-latest, UTC0)	1m 18s
timezones (macos-latest, Asia/Katmandu)	1m 38s
timezones (windows-latest, ACST-9:30)	2m 16s
check-docs	21s
timezones (windows-latest, EST4)	2m 1s
timezones (windows-latest, UTC0)	1m 22s
timezones (windows-latest, Asia/Katmandu)	2m 8s
cross-targets (x86_64-sun-solaris)	1m 5s
cross-tests (ubuntu-latest)	1m 40s
no_std (ubuntu-latest, thumbv6m-none-eabi)	21s
no_std (ubuntu-latest, x86_64-fortanix-unknown-sgx)	22s
rust_versions (ubuntu-latest, stable)	56s
rust_versions (ubuntu-latest, beta)	1m 10s
test_wasi (ubuntu-latest, wasm32-wasi)	30s
rust_versions (ubuntu-latest, nightly)	1m 7s
test_wasm (ubuntu-latest)	20s
	1h 0m 7s

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