fix starcoin_db_export apply open files limit

[nkysg]

Pull request type

Please check the type of change your PR introduces:

• Bugfix
• Feature
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Documentation content changes
• Other (please describe):

What is the current behavior?

Issue Number: N/A

What is the new behavior?

Other information

[codecov]

Codecov Report

Merging #3261 (9619ac9) into master (abb263c) will decrease coverage by 0.07%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #3261      +/-   ##
==========================================
- Coverage   31.78%   31.71%   -0.06%     
==========================================
  Files         493      499       +6     
  Lines       46062    46240     +178     
  Branches    21152    21215      +63     
==========================================
+ Hits        14635    14661      +26     
- Misses      17429    17559     +130     
- Partials    13998    14020      +22     

Flag	Coverage Δ
unittests	31.71% <0.00%> (-0.06%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
node/src/node.rs	10.62% <ø> (-1.71%)	⬇️
storage/src/db_storage/mod.rs	47.52% <0.00%> (-1.12%)	⬇️
test-helper/src/dummy_network_service.rs	22.23% <0.00%> (-14.81%)	⬇️
state/state-store-api/src/lib.rs	43.75% <0.00%> (-6.25%)	⬇️
commons/accumulator/src/tree.rs	51.71% <0.00%> (-3.90%)	⬇️
vm/types/src/token/token_code.rs	34.12% <0.00%> (-3.52%)	⬇️
storage/src/cache_storage/mod.rs	44.29% <0.00%> (-2.85%)	⬇️
sync/src/tasks/mock.rs	42.86% <0.00%> (-2.74%)	⬇️
commons/stream-task/src/event.rs	33.16% <0.00%> (-2.13%)	⬇️
vm/transaction-builder/src/lib.rs	24.70% <0.00%> (-1.95%)	⬇️
... and 72 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update abb263c...9619ac9. Read the comment docs.