fix(deps): update dependency python-dotenv to v1.2.1

Author: renovate[bot]

pyproject.toml

@@ -12,7 +12,7 @@ dependencies = [
     "alembic==1.17.0",
     "mysqlclient==2.2.7",
     "pymysql==1.1.2",
-    "python-dotenv==1.1.1",
+    "python-dotenv==1.2.1",
     "sqlalchemy==2.0.44",
 ]
 
@@ -25,7 +25,7 @@ dev = [
     "pymysql==1.1.2",
     "pytest==8.4.2",
     "pytest-alembic==0.12.1",
-    "python-dotenv==1.1.1",
+    "python-dotenv==1.2.1",
     "ruff==0.14.1",
     "sqlalchemy==2.0.44",
     "types-pymysql==1.1.0.20250916",