Make the GitHub actions script more parallel #4890

Job	Run time
Julia nightly - ubuntu-latest-x64 - General;Benchmarks;FileFormats;Nonlinear	12m 37s
Julia 1 - ubuntu-latest-x64 - General;Benchmarks;FileFormats;Nonlinear	11m 13s
Julia 1 - windows-latest-x64 - General;Benchmarks;FileFormats;Nonlinear	12m 28s
Julia 1.6 - ubuntu-latest-x64 - General;Benchmarks;FileFormats;Nonlinear	10m 18s
Julia 1 - ubuntu-latest-x86 - General;Benchmarks;FileFormats;Nonlinear	13m 45s
Julia nightly - ubuntu-latest-x64 - Bridges	40m 3s
Julia 1 - ubuntu-latest-x64 - Bridges	39m 30s
Julia 1 - windows-latest-x64 - Bridges	39m 1s
Julia 1.6 - ubuntu-latest-x64 - Bridges	29m 10s
Julia 1 - ubuntu-latest-x86 - Bridges	40m 18s
Julia nightly - ubuntu-latest-x64 - Test	24m 1s
Julia 1 - ubuntu-latest-x64 - Test	20m 29s
Julia 1 - windows-latest-x64 - Test	21m 51s
Julia 1.6 - ubuntu-latest-x64 - Test	15m 32s
Julia 1 - ubuntu-latest-x86 - Test	23m 42s
Julia nightly - ubuntu-latest-x64 - Utilities	26m 28s
Julia 1 - ubuntu-latest-x64 - Utilities	26m 44s
Julia 1 - windows-latest-x64 - Utilities	27m 15s
Julia 1.6 - ubuntu-latest-x64 - Utilities	18m 57s
Julia 1 - ubuntu-latest-x86 - Utilities	30m 50s
	8h 4m 12s

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