bugfix:fix error while the "context" is key word in DM8 when delete undolog

[whaon]

• I have registered the PR changes.

Ⅰ. Describe what this PR did

fix error while the "context" is key word in DM8 when delete undolog

Ⅱ. Does this pull request fix one issue?

fixes #7009

Ⅲ. Why don't you add test cases (unit test/integration test)?

Ⅳ. Describe how to verify it

Ⅴ. Special notes for reviews

[funky-eyes]

请登记pr和作者信息至changes文件夹中的中英两版2.x.md中
Please register the PR and author information into the Chinese and English versions of the 2.x.md file located in the changes folder.

[codecov]

Codecov Report

Attention: Patch coverage is 3.70370% with 52 lines in your changes missing coverage. Please review.

Project coverage is 52.53%. Comparing base (0a21dea) to head (cc16671).
Report is 1 commits behind head on 2.x.

Files with missing lines	Patch %	Lines
.../seata/rm/datasource/undo/dm/DmUndoLogManager.java	3.70%	52 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##                2.x    #7010      +/-   ##
============================================
- Coverage     52.60%   52.53%   -0.07%     
+ Complexity     6582     6581       -1     
============================================
  Files          1126     1126              
  Lines         39953    40007      +54     
  Branches       4688     4694       +6     
============================================
+ Hits          21017    21019       +2     
- Misses        16932    16983      +51     
- Partials       2004     2005       +1     

Files with missing lines	Coverage Δ
.../seata/rm/datasource/undo/dm/DmUndoLogManager.java	6.89% <3.70%> (-5.23%)	⬇️

... and 3 files with indirect coverage changes

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[whaon]

请登记pr和作者信息至changes文件夹中的中英两版2.x.md中 Please register the PR and author information into the Chinese and English versions of the 2.x.md file located in the changes folder.

done

[funky-eyes]

LGTM

[funky-eyes]

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