Add dependabot for GitHubActions. Use explicit version as floating ta…

[rnc]

…gs are not used

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: +0.17% 🎉

Comparison is base (efa2ca4) 78.51% compared to head (3ba1a3b) 78.69%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #445      +/-   ##
============================================
+ Coverage     78.51%   78.69%   +0.17%     
- Complexity      546      547       +1     
============================================
  Files            42       42              
  Lines          2323     2323              
  Branches        333      333              
============================================
+ Hits           1824     1828       +4     
+ Misses          372      369       -3     
+ Partials        127      126       -1     

see 2 files with indirect coverage changes

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