Force cloning verilator from github

[tgorochowik]

hdlconvertor uses a veripool url which seems to be down since some time.

[github-actions]

Changes In Tests

Tool	New Failures	New Passes	Added	Removed	Not Affected
Surelog	0	0	0	0	4651
moore	0	0	0	0	4588
Yosys	1	0	0	0	4309
SynligYosys	0	0	0	0	4309
Slang_parse	0	0	0	0	4588
circt_verilog	0	0	0	0	4641
Verilator	0	0	0	0	4666
tree_sitter_verilog	0	0	0	0	4497
Icarus	0	0	0	0	4666
Odin	0	0	0	0	4588
sv_parser	0	0	0	0	4588
yosys_slang	0	1	0	0	3847
Slang	0	0	0	0	4651
UhdmVerilator	0	0	0	0	4666
tree_sitter_systemverilog	0	0	0	0	4493
Verible	0	0	0	0	4497
Sv2v_zachjs	0	0	0	0	4651
VeribleExtractor	0	0	0	0	4497
moore_parse	0	0	0	0	4497

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