Bump github/codeql-action from 3.28.5 to 3.28.8 #125

Job	Run time
Rubygems on Ubuntu (3.0)	9s
Rubygems on Ubuntu (3.1)	14s
Rubygems on Ubuntu (3.2)	12s
Rubygems on Ubuntu (3.3)	14s
Rubygems on macOS (3.0)	11s
Rubygems on macOS (3.1)	22s
Rubygems on macOS (3.2)	17s
Rubygems on macOS (3.3)	15s
Rubygems on Windows (3.0)	5m 8s
Rubygems on Windows (3.1)	4m 52s
Rubygems on Windows (3.2)	4m 53s
Rubygems on Windows (3.3)	4m 43s
Rubygems on Ubuntu (jruby-9.4)	46s
Rubygems on Ubuntu (truffleruby)	31s
Rubygems on Windows (mswin)	3m 17s
Rubygems on Ubuntu (ruby-head)	40s
Rubygems on Ubuntu (truffleruby-head)	49s
	27m 33s

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