upgrade altair

Author: linogaliana

pyproject.toml

@@ -5,7 +5,7 @@ description = "Source code for Lino Galiana's Python for data science course"
 readme = "README.md"
 requires-python = ">=3.13,<3.14"
 dependencies = [
-    "altair>=5.4.1",
+    "altair>=6.0.0",
     "black==24.8.0",
     "cartiflette",
     "contextily==1.6.2",