fix(wasi-nn): disable shallow clone for BitNet dependency

[Sujanian1304]

Description

This PR fixes a build failure in the WASI-NN BitNet backend caused by the FetchContent configuration.

The Issue

The build was failing with the error:
fatal: invalid reference: 404980e

This occurred because cmake/WASINNDeps.cmake combined GIT_SHALLOW TRUE (depth 1) with a specific, older commit hash (404980e). Since the upstream microsoft/BitNet repository has moved forward significantly (the HEAD is now several months ahead of 404980e), the required commit is no longer present in a shallow clone of the default branch.

The Fix

I have disabled the shallow clone for the BitNet dependency (GIT_SHALLOW FALSE). This ensures the full history is fetched so that the specific commit 404980e can be successfully checked out during the build configuration.

Related Issues

Fixes #4635

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.98%. Comparing base (273ac6e) to head (c7328d3).
⚠️ Report is 3 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4638   +/-   ##
=======================================
  Coverage   80.97%   80.98%           
=======================================
  Files         300      300           
  Lines       40633    40632    -1     
  Branches     6720     6719    -1     
=======================================
+ Hits        32901    32904    +3     
+ Misses       5930     5928    -2     
+ Partials     1802     1800    -2     

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[hydai]

LGTM.

[Sujanian1304]

@hydai ,thanks for merging
Can you take a look at these PR's as well
#4542
#4625