Fix normalize fs path

[svittoz]

Solve issue with failing edsnlp.data.read_parquet("hdfs://path_to_parquet.parquet").

Description

Checklist

• [x] If this PR is a bug fix, the bug is documented in the test suite.
• [x] Changes were documented in the changelog (pending section).
• [x] If necessary, changes were made to the documentation (eg new pipeline).

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 97.44%. Comparing base (165bb2c) to head (8b4cc1d).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #283 +/- ## ======================================= Coverage 97.44% 97.44% ======================================= Files 262 262 Lines 9103 9103 ======================================= Hits 8870 8870 Misses 233 233 ```

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