Apprise: Disable the Apprise rate limiting subsystem

[amotl]

Apprise applies rate limiting with delays of ~4-5 seconds on subsequent message submissions. This is not desired for mqttwarn. Indirectly related: https://github.com/caronc/apprise/issues/735#issuecomment-1301595477.

@caronc: Maybe a future Apprise can be made configurable to only optionally enable rate limiting?

[codecov-commenter]

Codecov Report

Merging #613 (9dfb8f1) into main (9dfb8f1) will not change coverage. The diff coverage is n/a.

:exclamation: Current head 9dfb8f1 differs from pull request most recent head 88c2665. Consider uploading reports for the commit 88c2665 to get more accurate results

@@           Coverage Diff           @@
##             main     #613   +/-   ##
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  Coverage   37.50%   37.50%           
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  Files          80       80           
  Lines        3594     3594           
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  Hits         1348     1348           
  Misses       2246     2246           

Flag	Coverage Δ
unittests	37.50% <0.00%> (ø)

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