update shoutrrr version.

[AnalogJ]

fixes #355
fixes #420

Shoutrrr is being upgraded from v0.4.4 to v0.6.1. There have been a significant number of updates to the library, so I'll be releasing this as a minor version bump, rather than a patch

https://github.com/containrrr/shoutrrr/releases

[codecov-commenter]

Codecov Report

Merging #425 (61fde6a) into master (0febe3f) will decrease coverage by 0.34%.
The diff coverage is 5.26%.

@@            Coverage Diff             @@
##           master     #425      +/-   ##
==========================================
- Coverage   32.54%   32.19%   -0.35%     
==========================================
  Files          54       54              
  Lines        3045     3056      +11     
  Branches       66       66              
==========================================
- Hits          991      984       -7     
- Misses       2018     2036      +18     
  Partials       36       36              

Flag	Coverage Δ
unittests	32.19% <5.26%> (-0.35%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
webapp/backend/pkg/database/scrutiny_repository.go	11.97% <0.00%> (-0.64%)	⬇️
webapp/backend/pkg/web/server.go	62.26% <100.00%> (-4.41%)	⬇️

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