chore: remove pin

Signed-off-by: Victor Garcia Reolid <[email protected]>

setup.cfg

@@ -62,7 +62,7 @@ exclude =
 # Add here additional requirements for extra features, to install with:
 # `pip install flexmeasures-client[s2]` like:
 s2=
-    s2-python>=0.4.1 # reason: be compatible with constraint pydantic>=2.8.2
+    s2-python
     semver
 
 # Add here test requirements (semicolon/line-separated)