CompatHelper: bump compat for FillArrays to 1, (keep existing compat)

[github-actions]

This pull request changes the compat entry for the FillArrays package from 0.12, 0.13 to 0.12, 0.13, 1.
This keeps the compat entries for earlier versions.

Note: I have not tested your package with this new compat entry.
It is your responsibility to make sure that your package tests pass before you merge this pull request.

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -2.67% ⚠️

Comparison is base (198ee9f) 45.98% compared to head (f7b4984) 43.31%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #265      +/-   ##
==========================================
- Coverage   45.98%   43.31%   -2.67%     
==========================================
  Files          43       43              
  Lines        1344     1279      -65     
==========================================
- Hits          618      554      -64     
+ Misses        726      725       -1     

see 23 files with indirect coverage changes

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[github-actions]

Package name	latest	stable
Mitosis.jl
Soss.jl