Include the backend in the serialization of the Narwhals dataframe to ensure that it can be deserialized.

[hintse]

No description provided.

[github-actions]

Test Results

546 tests  +1   542 ✅ +1   1m 37s ⏱️ -2s
  1 suites ±0     4 💤 ±0 
  1 files   ±0     0 ❌ ±0 

Results for commit 409123e. ± Comparison against base commit 1345a67.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.51%. Comparing base (1345a67) to head (409123e).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #174   +/-   ##
=======================================
  Coverage   95.50%   95.51%           
=======================================
  Files         132      132           
  Lines        8463     8473   +10     
  Branches      521      523    +2     
=======================================
+ Hits         8083     8093   +10     
  Misses        262      262           
  Partials      118      118           

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