Bump minimum supported Gradle version to 6.7.1

[3flex]

Aligns to Kotlin 1.7.0, and allows us to support Java Toolchains.

[3flex]

Off topic - do we need both a milestone AND the blocked tag?

I think of blockers as being something external that prevents merging for some reason, but this PR isn't blocked by anything, we're just making the choice not to merge it yet, and the milestone has been set appropriately.

[cortinico]

Off topic - do we need both a milestone AND the blocked tag?

Nope not necessarily. But the blocked tag is red and has a better visual cue and is harder to miss. Milestones instead can be confused easily as it's just a matter of a character.

[3flex]

Maybe we should have a separate "don't merge yet" or "queued for next release" tag (or something like it)?

[cortinico]

Maybe we should have a separate "don't merge yet" or "queued for next release" tag (or something like it)?

I'm fine either way 👍

[codecov]

Codecov Report

Merging #4964 (324f050) into main (4015679) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##               main    #4964   +/-   ##
=========================================
  Coverage     84.92%   84.92%           
  Complexity     3605     3605           
=========================================
  Files           502      502           
  Lines         11873    11873           
  Branches       2227     2227           
=========================================
  Hits          10083    10083           
  Misses          691      691           
  Partials       1099     1099           

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