Update to Gleam 1.2.1 #47

Job	Run time
lint-build	39s
rustfmt	6s
test-flake (x86_64-unknown-linux-gnu)	10m 19s
test (stable, x86_64-unknown-linux-gnu)	3m 40s
test-flake (x86_64-unknown-linux-musl)	10m 22s
test (stable, x86_64-unknown-linux-musl)	5m 19s
test-wasm	1m 6s
test-flake (aarch64-unknown-linux-musl)	10m 26s
test (stable, aarch64-unknown-linux-gnu)	2m 7s
test-flake (x86_64-apple-darwin)	11m 27s
test (stable, aarch64-unknown-linux-musl)	2m 39s
test-flake (aarch64-apple-darwin, macos-14)	6m 45s
test (stable, x86_64-apple-darwin)	5m 43s
test (stable, x86_64-pc-windows-msvc)	6m 4s
test (stable, aarch64-apple-darwin, macos-14, false, true, true)	3m 6s
test-projects	1m 53s
	1h 21m 41s

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