fix: Issue/806: Add a lock to prevent the disposal of the timer while it is running.

[OrezzerO]

• fix: Issue/806

Closes #806 806

Proposed Changes

Add a lock to prevent the disposal of the timer while it is running.

Checklist

• CHANGELOG.md updated
• Rebased/mergeable
• A test has been added if appropriate
• mvn test completes successfully
• Commit messages are conventional
• Sign CLA (if not already signed)

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 77.77778% with 2 lines in your changes missing coverage. Please review.

Project coverage is 88.50%. Comparing base (d641b11) to head (e2bdf03).

Files with missing lines	Patch %	Lines
...nternal/flowable/FlowableBufferTimedFlushable.java	77.77%	0 Missing and 2 partials ⚠️

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Additional details and impacted files

@@             Coverage Diff              @@
##             master     #807      +/-   ##
============================================
- Coverage     88.50%   88.50%   -0.01%     
+ Complexity      787      785       -2     
============================================
  Files           174      174              
  Lines          7203     7210       +7     
  Branches        405      407       +2     
============================================
+ Hits           6375     6381       +6     
  Misses          697      697              
- Partials        131      132       +1     

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