refactor(referencefs): override _open only for fsspec<2025.2.0

[skshetry]

Following changes from fsspec/filesystem_spec#1778.

[cloudflare-workers-and-pages]

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[codecov]

Codecov Report

Attention: Patch coverage is 84.61538% with 2 lines in your changes missing coverage. Please review.

Project coverage is 87.64%. Comparing base (143b4be) to head (8e36956).
Report is 10 commits behind head on main.

Files with missing lines	Patch %	Lines
src/datachain/fs/reference.py	83.33%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #884      +/-   ##
==========================================
- Coverage   87.65%   87.64%   -0.02%     
==========================================
  Files         128      129       +1     
  Lines       11457    11463       +6     
  Branches     1544     1545       +1     
==========================================
+ Hits        10043    10047       +4     
- Misses       1026     1027       +1     
- Partials      388      389       +1     

Flag	Coverage Δ
datachain	87.56% <84.61%> (-0.02%)	⬇️

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