Bump actions/checkout from 2 to 4 #221

Job	Run time
Build on ubuntu:20.04 - gcc	8m 30s
Build on ubuntu:20.04 - clang	8m 35s
Build on ubuntu:22.04 - gcc	7m 42s
Build on ubuntu:22.04 - clang	8m 36s
Build on ubuntu:24.04 - gcc	9m 30s
Build on ubuntu:24.04 - clang	9m 10s
Build on debian:stable - gcc	8m 29s
Build on debian:stable - clang	8m 44s
Build on debian:sid - gcc	8m 15s
Build on debian:sid - clang	9m 9s
Build on quay.io/rockylinux/rockylinux:8 - gcc	9m 13s
Build on quay.io/rockylinux/rockylinux:8 - clang	9m 13s
Build on quay.io/centos/centos:stream9 - gcc	8m 43s
Build on quay.io/centos/centos:stream9 - clang	9m 29s
Build on fedora:latest - gcc	8m 24s
Build on fedora:latest - clang	8m 36s
	2h 20m 18s

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