Specify Erlang v27 in the CI workflow for new projects #7709

Job	Run time
test-wasm	1m 9s
rustfmt	13s
test (stable, x86_64-unknown-linux-gnu)	3m 48s
lint-build	53s
test (stable, x86_64-unknown-linux-musl)	6m 3s
validate	8s
test (stable, aarch64-unknown-linux-gnu)	2m 18s
test (stable, aarch64-unknown-linux-musl)	2m 43s
test (stable, x86_64-apple-darwin)	8m 59s
test (stable, x86_64-pc-windows-msvc)	6m 34s
test (stable, aarch64-apple-darwin, macos-latest, false, true)	3m 57s
test-projects	1m 29s
	38m 14s

Provide feedback