remove the lock for parametric execution

[Nicole00]

No description provided.

[codecov-commenter]

Codecov Report

Patch coverage has no change and project coverage change: +0.25 🎉

Comparison is base (4f84e19) 63.25% compared to head (2638ac7) 63.50%.

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Additional details and impacted files

@@             Coverage Diff              @@
##             master     #528      +/-   ##
============================================
+ Coverage     63.25%   63.50%   +0.25%     
- Complexity      791      795       +4     
============================================
  Files            72       72              
  Lines          3875     3875              
  Branches        535      535              
============================================
+ Hits           2451     2461      +10     
+ Misses         1056     1048       -8     
+ Partials        368      366       -2     

Impacted Files	Coverage Δ
...va/com/vesoft/nebula/client/graph/SessionPool.java	52.58% <ø> (ø)

... and 1 file with indirect coverage changes

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[hesy007]

the lock is not necessary ！！