fix(s3stream): guard BlockCache OOM handle with lock

[SCNieh]

No description provided.

[codecov]

Codecov Report

Merging #775 (42ddc39) into main (60cfe08) will decrease coverage by 0.04%.
Report is 6 commits behind head on main.
The diff coverage is n/a.

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #775      +/-   ##
============================================
- Coverage     57.54%   57.51%   -0.04%     
+ Complexity     1224     1221       -3     
============================================
  Files           131      131              
  Lines          8042     8042              
  Branches        740      740              
============================================
- Hits           4628     4625       -3     
  Misses         3017     3017              
- Partials        397      400       +3     

Components	Coverage Δ
RocketMQ Broker	∅ <ø> (∅)
RocketMQ Common	5.80% <ø> (ø)
RocketMQ Controller	55.13% <ø> (ø)
RocketMQ Proxy	42.62% <ø> (-0.13%)	⬇️
RocketMQ Store	76.96% <ø> (-0.05%)	⬇️
RocketMQ Stream	∅ <ø> (∅)
RocketMQ Metadata	35.44% <ø> (ø)

see 2 files with indirect coverage changes