Bump maven to latest version 3.9.9

[pierDipi]

./mvnw -N wrapper:wrapper -Dmaven=3.9.9

Also remove editorconfig as it's unused

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: pierDipi

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 48.55%. Comparing base (76e67cd) to head (13aa7b9).
Report is 27 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4096   +/-   ##
=======================================
  Coverage   48.55%   48.55%           
=======================================
  Files         244      244           
  Lines       14825    14825           
=======================================
  Hits         7199     7199           
  Misses       6912     6912           
  Partials      714      714           

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[pierDipi]

/retest

[pierDipi]

/cc @creydr @matzew

[creydr]

/lgtm

[matzew]

/retest

[matzew]

/retest-required

[matzew]

/test reconciler-tests-namespaced-broker

[matzew]

/test reconciler-tests-namespaced-broker

[knative-prow]

@pierDipi: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
upgrade-tests_eventing-kafka-broker_main	13aa7b9	link	unknown	/test upgrade-tests

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