Fix grammatical issue

[arku]

Description

has warned about inactivity -> has been warned about inactivity

Checklist

• linter status: 100% pass
• changes don't break existing behavior
• commit message follows commit guidelines

[codecov]

Codecov Report

Merging #1085 into master will decrease coverage by 0.04%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master    #1085      +/-   ##
==========================================
- Coverage      32%   31.96%   -0.05%     
==========================================
  Files         105      105              
  Lines        7284     7284              
  Branches      948      948              
==========================================
- Hits         2331     2328       -3     
- Misses       4845     4848       +3     
  Partials      108      108

Impacted Files	Coverage Δ
app/dashboard/notifications.py	15.91% <0%> (ø)	⬆️
app/app/settings.py	80.79% <0%> (-1.99%)	⬇️

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[mbeacom]

Nice catch! Thanks!