bug(common): stable build trigger fails to update master history.md

* 16.0.140: https://build.palaso.org/buildConfiguration/Keyman_TriggerReleaseBuildsStable/398041?buildTab=log&focusLine=309&linesState=103&logView=flowAware
* 16.0.141: https://build.palaso.org/buildConfiguration/Keyman_TriggerReleaseBuildsStable/398694?buildTab=log&focusLine=0&linesState=144&logView=flowAware

```
08:27:40 Switched to a new branch 'chore/version-stable-16.0-16.0.141-master-history'
08:27:40 M HISTORY.md
08:27:40 M resources/gosh/gosh.js
08:27:40 warning: LF will be replaced by CRLF in HISTORY.md.
08:27:40 The file will have its original line endings in your working directory
08:27:41 [chore/version-stable-16.0-16.0.141-master-history dadd645b4f] auto: increment stable-16.0 version to 16.0.141 (history cherry-pick to master)
08:27:41 1 file changed, 15 insertions(+)
08:27:42 Error creating pull request: Unprocessable Entity (HTTP 422)
08:27:42 Invalid value for "head"
08:27:42 Process exited with code 1
```