feat: update shoutrrr to v0.7

[piksel]

Update shoutrrr to v0.7, which adds ntfy support and bugfixes.

[codecov]

Codecov Report

Base: 66.76% // Head: 66.77% // Increases project coverage by +0.01% 🎉

Coverage data is based on head (5c924c7) compared to base (547d033).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1543      +/-   ##
==========================================
+ Coverage   66.76%   66.77%   +0.01%     
==========================================
  Files          25       25              
  Lines        2365     2366       +1     
==========================================
+ Hits         1579     1580       +1     
  Misses        685      685              
  Partials      101      101              

Impacted Files	Coverage Δ
pkg/notifications/email.go	94.00% <100.00%> (+0.12%)	⬆️

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