fix: fix typo to fix CI typo check

[alamb]

Description

Fix a typo that is failing on CI on my PR: #3603

Here is an example failure

• https://github.com/delta-io/delta-rs/actions/runs/16379294197/job/46286870241?pr=3603

Warning: "moutn" should be "mount".
Warning: "moutn" should be "mount".
error: `moutn` should be `mount`
  --> ./crates/mount/src/lib.rs:45:13
   |
45 |         let moutn_config =
   |             ^^^^^
   |
error: `moutn` should be `mount`
  --> ./crates/mount/src/lib.rs:49:13
   |
49 |             moutn_config
   |             ^^^^^

Related Issue(s)

• chore: update to DataFusion 49.0.0 #3603

Documentation

[alamb]

🤦 -- I am not sure how the spell check CI test is failing given I fixed it in this PR 🤔

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 20.69%. Comparing base (6a4f249) to head (fb18456).
Report is 1 commits behind head on main.

❗ There is a different number of reports uploaded between BASE (6a4f249) and HEAD (fb18456). Click for more details.

HEAD has 4 uploads less than BASE

Flag	BASE (6a4f249)	HEAD (fb18456)
	6	2

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #3604       +/-   ##
===========================================
- Coverage   74.50%   20.69%   -53.82%     
===========================================
  Files         146       76       -70     
  Lines       44876    13270    -31606     
  Branches    44876    13270    -31606     
===========================================
- Hits        33437     2746    -30691     
- Misses       9248    10243      +995     
+ Partials     2191      281     -1910     

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