[release-0.22] Fix out of bounds in unordered offset manager

[knative-prow-robot]

This is an automated cherry-pick of #814

:bug: Fix out of bounds in unordered offset manager

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[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (release-0.22@05529c6). Click here to learn what that means.
The diff coverage is 100.00%.

@@               Coverage Diff               @@
##             release-0.22     #816   +/-   ##
===============================================
  Coverage                ?   76.53%           
  Complexity              ?      439           
===============================================
  Files                   ?       77           
  Lines                   ?     2924           
  Branches                ?      133           
===============================================
  Hits                    ?     2238           
  Misses                  ?      535           
  Partials                ?      151           

Flag	Coverage Δ	Complexity Δ
java-unittests	80.20% <100.00%> (?)	439.00 <0.00> (?)

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Impacted Files	Coverage Δ	Complexity Δ
...spatcher/consumer/impl/UnorderedOffsetManager.java	100.00% <100.00%> (ø)	13.00 <0.00> (?)

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[pierDipi]

/retest

[slinkydeveloper]

/lgtm

[knative-prow-robot]

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[pierDipi]

@slinkydeveloper this needs your CLA consent :)

[google-cla]

☹️ Sorry, but only Googlers may change the label cla: yes.

[slinkydeveloper]

@googlebot I consent.