Bump examples/codelabs from `ec2353b` to `8377b8f` #411

Job	Run time
Validate Firebase configuration	25s
Check if code excerpts are up to date	55s
Analyze and test code examples (Beta channel, beta, true)	10m 53s
Build site and check links	4m 15s
Analyze and test code examples (Stable channel, stable, false)	12m 6s
	28m 34s

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