ci: fix getLatestLabel

[gkalpak]

Please check if the PR fulfills these requirements

• The commit message follows our guidelines: https://github.com/angular/angular/blob/master/CONTRIBUTING.md#commit
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

What kind of change does this PR introduce? (check one with "x")

[ ] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[x] CI related changes
[ ] Other... Please describe:

What is the current behavior? (You can also link to an open issue here)
getLatestLabel is broken when iteratively trying to deepen the clone.
Returns: Looking for latest tag at depth 100...\n4.0.0-beta.7

What is the new behavior?
getLatestLabel works correctly when iteratively trying to deepen the clone.
Returns: 4.0.0-beta.7

Does this PR introduce a breaking change? (check one with "x")

[ ] Yes
[x] No

[IgorMinar]

Please in the future explain briefly why this fix works. In this case it was not obvious and I had to look into it :-)

for the record, the output of this file is used to determine the version, so echoing anything else messes up with sed command that replaces version placeholders with the output from this script.

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