Prepare for upcoming 3.0.0 release

[kingthorin]

This should be everything that needs updates for a 3.x release. I've tried to make the release script unit tests more generic and not chasing versions.

I'm happy to rebase this on anything else that lands today.

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✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.62%. Comparing base (3c0a16a) to head (3fa2c9e).
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Additional details and impacted files

@@             Coverage Diff              @@
##               main    #1875      +/-   ##
============================================
+ Coverage     92.58%   92.62%   +0.04%     
- Complexity     3563     3564       +1     
============================================
  Files           346      346              
  Lines          7050     7050              
  Branches        678      678              
============================================
+ Hits           6527     6530       +3     
+ Misses          364      362       -2     
+ Partials        159      158       -1     

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[kingthorin]

This should be good to go now.

[kingthorin]

No input after 5d, assuming fine.

[asolntsev]

@kingthorin @bodiam Shouldn't we already release DF 3.0.0? :)

[bodiam]

Not sure. If there's nothing stopping us from having the release, I have no issues releasing 3.0

[snuyanzin]

if it is about 3.x
how about making jdk21 as minimum supported?

[asolntsev]

how about making jdk21 as minimum supported?

I personally have nothing against it,
but I also don't see any good reason to increase JDK version. It will cut off some part of our users, while not giving us any significant preferences.

[kingthorin]

Are there any pending PRs that we really want inn/done before 3.0.0?

[asolntsev]

Looks like these are need to run DF in GraalVM:

• Register FakeValuesService expression resolution types in native-image metadata (#1737) #1913
• Added config generator for GraalVM and updated config. #1744

(though, I don't know if they are critical for 3.0)