CompatHelper: bump compat for Makie to 0.18, (keep existing compat)

[github-actions]

This pull request changes the compat entry for the Makie package from 0.15.2, 0.16, 0.17 to 0.15.2, 0.16, 0.17, 0.18.
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.

[coveralls]

Pull Request Test Coverage Report for Build 3242164020

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage decreased (-0.3%) to 23.188%

---

Files with Coverage Reduction	New Missed Lines	%
src/recipes/gpsample.jl	1	0.0%

Totals
Change from base Build 2287400255:	-0.3%
Covered Lines:	16
Relevant Lines:	69

---

💛 - Coveralls

[codecov]

Codecov Report

Base: 23.52% // Head: 23.18% // Decreases project coverage by -0.34% ⚠️

Coverage data is based on head (6e2c54c) compared to base (fe6b66a).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #43      +/-   ##
==========================================
- Coverage   23.52%   23.18%   -0.35%     
==========================================
  Files           4        4              
  Lines          68       69       +1     
==========================================
  Hits           16       16              
- Misses         52       53       +1     

Impacted Files	Coverage Δ
src/recipes/gpsample.jl	0.00% <0.00%> (ø)

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