Update dependency protobuf to v6

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Author: mend-for-github-com[bot]

poetry.lock

@@ -15,7 +15,7 @@ isort = "*"
 flake8 = "^7.0.0"
 black = "*"
 autoflake = "*"
-protobuf = "^5.0.0"
+protobuf = "^6.0.0"
 types-protobuf = "*"
 2to3 = "*"
 sortedcollections = "*"