➖ Drop support for Python 3.8 in CI and docs (#1695)

Co-authored-by: Yurii Motov <yurii.motov.monte@gmail.com>
Co-authored-by: Motov Yurii <109919500+YuriiMotov@users.noreply.github.com>

docs_src/tutorial/insert/tutorial003_py39.py

@@ -0,0 +1,43 @@
+from typing import Optional
+
+from sqlmodel import Field, Session, SQLModel, create_engine
+
+
+class Hero(SQLModel, table=True):
+    id: Optional[int] = Field(default=None, primary_key=True)
+    name: str
+    secret_name: str
+    age: Optional[int] = None
+
+
+sqlite_file_name = "database.db"
+sqlite_url = f"sqlite:///{sqlite_file_name}"
+
+engine = create_engine(sqlite_url, echo=True)
+
+
+def create_db_and_tables():
+    SQLModel.metadata.create_all(engine)
+
+
+def create_heroes():  # (1)!
+    hero_1 = Hero(name="Deadpond", secret_name="Dive Wilson")  # (2)!
+    hero_2 = Hero(name="Spider-Boy", secret_name="Pedro Parqueador")
+    hero_3 = Hero(name="Rusty-Man", secret_name="Tommy Sharp", age=48)
+
+    with Session(engine) as session:  # (3)!
+        session.add(hero_1)  # (4)!
+        session.add(hero_2)
+        session.add(hero_3)
+
+        session.commit()  # (5)!
+    # (6)!
+
+
+def main():  # (7)!
+    create_db_and_tables()  # (8)!
+    create_heroes()  # (9)!
+
+
+if __name__ == "__main__":  # (10)!
+    main()  # (11)!