Widen the dependencies in the docs

API repositories are really libraries, so they should provide a range
of dependencies as wide as possible so users have more flexibility.

Signed-off-by: Leandro Lucarella <[email protected]>

Author: llucax

src/frequenz/repo/config/__init__.py

@@ -196,9 +196,9 @@
 
 [project]
 dependencies = [
-  "frequenz-api-common == 0.2.0",
-  "googleapis-common-protos == 1.56.2",
-  "grpcio == 1.51.0",
+  "frequenz-api-common >= 0.2.0, < 0.3.0",
+  "googleapis-common-protos >= 1.56.2, < 2",
+  "grpcio >= 1.51.1, < 2",
 ]
 ```