Update the grails-gradle-publish plugin to the staged 1.0.0-M2 version

[jdaugherty]

Now that 1.0.0-M2 is staged, this PR updates to a non-snapshot version so we can release the M4

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 51.4414%. Comparing base (5c285ef) to head (fced1db).
⚠️ Report is 2 commits behind head on 8.0.x.

Additional details and impacted files

@@               Coverage Diff                @@
##             8.0.x     #16012         +/-   ##
================================================
+ Coverage         0   51.4414%   +51.4414%     
- Complexity       0      17727      +17727     
================================================
  Files            0       2039       +2039     
  Lines            0      95497      +95497     
  Branches         0      16564      +16564     
================================================
+ Hits             0      49125      +49125     
- Misses           0      39074      +39074     
- Partials         0       7298       +7298     

see 2039 files with indirect coverage changes

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