Update Dependabot to actually group dependency updates

[SentryMan]

Now dependabot should create a single PR for the dependency updates. Example dependabot PR: SentryMan/avaje-javalin-api-example#50

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.30%. Comparing base (3afb5b3) to head (e1c4854).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #2322   +/-   ##
=========================================
  Coverage     86.30%   86.30%           
  Complexity     1311     1311           
=========================================
  Files           148      148           
  Lines          4044     4044           
  Branches        508      508           
=========================================
  Hits           3490     3490           
  Misses          333      333           
  Partials        221      221           

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[tipsy]

@SentryMan I believe we had this, but it didn't work too well, so we reverted back to single commits once per month. Or is this something else?

[SentryMan]

Can you expand on that?

[tipsy]

#2202
b87db25

Appears to be the same setup that we had.

I can't find the actual issues/PRs now, but basically dependabot would ignore all chat commands to skip versions or rebuild, which made it impossible to merge any of the PRs. I got so frustrated that I reverted back to having individual commits.

[SentryMan]

I also tried that dependency group for both dev and the other, but this new config worked for me

[tipsy]

We'll give a try, thank you🫡