fix(publish): remove Cargo.lock v4 before cross-compile (rb-sys-dock … #10

Job	Run time
Fetch supported Ruby versions	6s
Lint (rustfmt + clippy)	48s
Source gem install + require	4m 1s
Test - Ruby 4.0 (macos-latest)	4m 5s
Test - Ruby 3.4 (macos-latest)	4m 10s
Test - Ruby 4.0 (ubuntu-latest)	4m 11s
Test - Ruby 3.4 (ubuntu-latest)	3m 56s
Test - Ruby 3.3 (ubuntu-latest)	4m 7s
Test - Ruby 3.3 (macos-latest)	5m 46s
Test - Ruby 4.0 (windows-latest)	8m 26s
Test - Ruby 3.4 (windows-latest)	9m 11s
Test - Ruby 3.3 (windows-latest)	8m 29s
	57m 16s

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