test

Document `pub upgrade` flag `--unlock-transitive` (#6188) #1916

Job	Run time
Build site and check links	56s
Check if code excerpts are up to date	16s
Validate Firebase configuration	19s
Check if text can be replaced with site variables	25s
Analyze and test code examples (beta, false)	1m 51s
Analyze and test code examples (stable, false)	1m 55s
	5m 42s

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