Improved on Gunicorn configuration for resource improvements

[caronc]

Description:

Related issue (if applicable): refs #117

Improvements made to Gunicorn's configuration in attempts to improve the resources consumed by the Apprise API when self hosted.

Checklist

• [x] The code change is tested and works locally.
• [x] There is no commented out code in this PR.
• [x] No lint errors (use flake8)
• [ ] Tests added

[codecov-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (e9886c4) 94.97% compared to head (3a3bb9d) 94.97%.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #125 +/- ## ======================================= Coverage 94.97% 94.97% ======================================= Files 15 15 Lines 1433 1433 ======================================= Hits 1361 1361 Misses 72 72 ```

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