Download ginac/cln archive instead of using git repo #159

Job	Run time
Minimal dependencies Tests (Debug)	11m 48s
Test and Deploy (Debug)	7m 51s
Minimal dependencies Tests (Release)	11m 52s
Distro Tests (debian-12, Debug)	7m 43s
Test and Deploy (Release)	7m 0s
Distro Tests (debian-12, Release)	7m 3s
Distro Tests (ubuntu-22.04, Debug)	6m 53s
Distro Tests (ubuntu-22.04, Release)	6m 35s
Distro Tests (ubuntu-24.04, Debug)	7m 33s
Distro Tests (ubuntu-24.04, Release)	7m 10s
Email notification	4s
	1h 21m 32s

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