ci: upgrade Actions to use Node 20 #321

Job	Run time
Run linting and unit tests (3.9, 3.9-slim-bookworm, 4.4, 12345)	3m 28s
Run linting and unit tests (3.9, 3.9-slim-bookworm, 5.0, 12345)	3m 32s
Run linting and unit tests (3.9, 3.9-slim-bookworm, 6.0, 12345)	3m 29s
Run linting and unit tests (3.9, 3.9-slim-bookworm, 7.0, 12345)	3m 29s
Run linting and unit tests (3.10, 3.10-slim-bookworm, 4.4, 12345)	3m 12s
Run linting and unit tests (3.10, 3.10-slim-bookworm, 5.0, 12345)	3m 21s
Run linting and unit tests (3.10, 3.10-slim-bookworm, 6.0, 12345)	3m 20s
Run linting and unit tests (3.10, 3.10-slim-bookworm, 7.0, 12345)	3m 17s
Run linting and unit tests (3.11, 3.11-slim-bookworm, 4.4, 12345)	3m 17s
Run linting and unit tests (3.11, 3.11-slim-bookworm, 5.0, 12345)	3m 16s
Run linting and unit tests (3.11, 3.11-slim-bookworm, 6.0, 12345)	3m 23s
Run linting and unit tests (3.11, 3.11-slim-bookworm, 7.0, 12345)	3m 4s
Run linting and unit tests (3.12, 3.12-slim-bookworm, 4.4, 12345)	3m 32s
Run linting and unit tests (3.12, 3.12-slim-bookworm, 5.0, 12345)	3m 38s
Run linting and unit tests (3.12, 3.12-slim-bookworm, 6.0, 12345)	3m 36s
Run linting and unit tests (3.12, 3.12-slim-bookworm, 7.0, 12345)	3m 21s
Docker (3.9, 3.9-slim-bookworm)	1m 23s
Docker (3.10, 3.10-slim-bookworm)	1m 20s
Docker (3.11, 3.11-slim-bookworm)	1m 20s
Docker (3.12, 3.12-slim-bookworm, latest)	1m 30s
	59m 48s

Provide feedback