Set julia compat to v1.10

[jishnub]

Since v1.10 is the LTS now, we may focus development only on v1.10+. Versions of this pacakge <v1.15 would continue to be compatible with julia v1.6.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.48%. Comparing base (6f61dc3) to head (173acaf).
Report is 6 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #397      +/-   ##
==========================================
- Coverage   99.91%   99.48%   -0.44%     
==========================================
  Files           8        8              
  Lines        1147     1154       +7     
==========================================
+ Hits         1146     1148       +2     
- Misses          1        6       +5     

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[devmotion]

I think it would be a good opportunity to also clean up existing VERSION checks in the package and the tests.

[devmotion]

It actually seems that Julia < 1.10.10 is completely untested at this point:

FillArrays.jl/.github/workflows/ci.yml

Lines 40 to 43 in f160c66

	version:
	- 'lts'
	- '1'
	- 'pre'

You might want to test min as well (which currently would be 1.6.0 and with this PR 1.10.0, in contrast to lts which is 1.10.10).