fix: Set correct comparison operator for snowflake-sqlalchemy pinning (#16526)

diff --git a/setup.py b/setup.py
index e6c9f82..957e135 100644
--- a/setup.py
+++ b/setup.py
@@ -152,7 +152,7 @@
             "shillelagh[datasetteapi,gsheetsapi,socrata,weatherapi]>=1.0.3, <2"
         ],
         "snowflake": [
-            "snowflake-sqlalchemy>=1.2.4"
+            "snowflake-sqlalchemy==1.2.4"
         ],  # PINNED! 1.2.5 introduced breaking changes requiring sqlalchemy>=1.4.0
         "teradata": ["sqlalchemy-teradata==0.9.0.dev0"],
         "thumbnails": ["Pillow>=7.0.0, <8.0.0"],