[chloggen] Update permissions of the generated files

[pantuza]

Contributions

When you use chloggen new --config template.yaml --filename contribution.yaml the generated file
has 0755 permission. Thus, it generates yaml files with Execution permission.

Maybe you folks have a purpose for doing it. Although, I didn't find any explanation for it.
Therefore, from my perspective, it seems to be a "bug". Please close this PR in case I am wrong.

This Pull Request updates the code in order to use the permission 0644 where we have:

• User: Write, Read, No Execution
• Group: No Write, Read, No Execution
• Others: No Write, Read, No Execution

Context

I was writing this Pull Request to Open Telemetry Collectors and realized that this tool (chloggen) was creating executable files under .chloggen/directory which seemed strange to me.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (2aabfff) 63.65% compared to head (ba2b497) 63.65%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #457   +/-   ##
=======================================
  Coverage   63.65%   63.65%           
=======================================
  Files          39       39           
  Lines        2259     2259           
=======================================
  Hits         1438     1438           
  Misses        677      677           
  Partials      144      144           

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[renanbastos93]

LGTM