gemspec: Use Puma >=4.3.8 to avoid security issue #956
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What kind of change is this?
Puma is a development dependency, and this PR updates how we include it, to avoid a warning about a CVE.
Did you add tests for your changes?
No.
Summary of changes
Mitigates warnings about CVE-2021-29509.
Other information
The Puma we pointed to was quite old.
The logs already say:
Using puma 5.3.1
in GH Actions.