switch db_dtypes into 1.4.2

Author: chelsea-lin

setup.py

@@ -60,8 +60,7 @@
     "ipywidgets >=7.7.1",
     "humanize >=4.6.0",
     "matplotlib >=3.7.1",
-    "db-dtypes@ git+https://github.com/googleapis/python-db-dtypes-pandas.git@main",
-    # "db-dtypes >=1.4.0",
+    "db-dtypes >=1.4.2",
     # For vendored ibis-framework.
     "atpublic>=2.3,<6",
     "parsy>=2,<3",

testing/constraints-3.9.txt

@@ -25,7 +25,7 @@ tabulate==0.9
 ipywidgets==7.7.1
 humanize==4.6.0
 matplotlib==3.7.1
-db-dtypes==1.4.0
+db-dtypes==1.4.2
 # For vendored ibis-framework.
 atpublic==2.3
 parsy==2.0