Bump actions/download-artifact from 7 to 8 (#28) #39

Job	Run time
Discover Languages with CodeQL Unit Tests	1m 53s
Use `qlt` to run unit tests for language=go	6m 17s
Use `qlt` to run unit tests for language=java	7m 47s
Use `qlt` to run unit tests for language=python	8m 50s
Use `qlt` to run unit tests for language=ruby	6m 52s
Use `qlt` to run unit tests for language=cpp	5m 19s
Use `qlt` to run unit tests for language=csharp	5m 19s
Use `qlt` to run unit tests for language=javascript	6m 19s
Validate test results	10s
	48m 46s

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