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Prerequisite

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• My PR addresses the following pyenv issue (if any)
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Description

• Here are some details about my PR

Now that it's out of beta at Github.

Also use the rolling release runner for ubuntu_build.
Since we only use one OS version for it and the changes between versions are not as drastic as with MacOS,
it looks safe enough to have it upgrade automatically.

Tests

• My PR adds the following unit tests (if any)
  N/A