Tests

Bump actions/checkout from 4 to 6 (#7) #52

Job	Run time
Tests (lts, macOS-latest) / Julia lts - macOS-latest	54s
Tests (lts, ubuntu-latest) / Julia lts - ubuntu-latest	51s
Tests (lts, windows-latest) / Julia lts - windows-latest	1m 38s
Tests (1, ubuntu-latest) / Julia 1 - ubuntu-latest	1m 14s
Tests (1, macOS-latest) / Julia 1 - macOS-latest	1m 16s
Tests (1, windows-latest) / Julia 1 - windows-latest	1m 42s
	7m 35s

Provide feedback