Bump protobuf and grpcio to 6.31.1 and 1.72.1 respectively

Signed-off-by: Leandro Lucarella <luca-frequenz@llucax.com>

Author: llucax

pyproject.toml

@@ -10,9 +10,9 @@ requires = [
   # sure the code is generated using the minimum supported versions, as older
   # versions can't work with code that was generated with newer versions.
   # https://protobuf.dev/support/cross-version-runtime-guarantee/#backwards
-  "protobuf == 5.29.3",
-  "grpcio-tools == 1.70.0",
-  "grpcio == 1.70.0",
+  "protobuf == 6.31.1",
+  "grpcio-tools == 1.72.1",
+  "grpcio == 1.72.1",
 
 ]
 build-backend = "setuptools.build_meta"
@@ -48,11 +48,11 @@ dependencies = [
   # We can't widen beyond the current value unless we bump the minimum
   # requirements too because of protobuf cross-version runtime guarantees:
   # https://protobuf.dev/support/cross-version-runtime-guarantee/#major
-  "protobuf >= 5.29.3, < 7", # Do not widen beyond 7!
+  "protobuf >= 6.31.1, < 8", # Do not widen beyond 8!
   # We couldn't find any document with a spec about the cross-version runtime
   # guarantee for grpcio, so unless we find one in the future, we'll assume
   # major version jumps are not compatible
-  "grpcio >= 1.70.0, < 2", # Do not widen beyond 2!
+  "grpcio >= 1.72.1, < 2", # Do not widen beyond 2!
 ]
 dynamic = ["version"]