CHORE: Couple mssql-python to mssql-python-odbc==18.6.2

Add exact-pinned mssql-python-odbc==18.6.2 to install_requires so mssql-python pulls the standalone ODBC Driver 18 package. Loader remains fallback-safe (uses bundled libs when the external package is absent/incomplete).

AB#46586

Author: jahnvi480

setup.py

@@ -191,6 +191,7 @@ def run(self):
     # Add dependencies
     install_requires=[
         "azure-identity>=1.12.0",  # Azure authentication library
+        "mssql-python-odbc==18.6.2",  # ODBC Driver 18 binaries (standalone package)
     ],
     extras_require={
         "pyarrow": ["pyarrow>=14.0.0"],