Bump Google.Protobuf from 3.4.1 to 3.15.0 in /src/Chinchilla.Serializers.Protobuf.Specifications#103
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dependabot[bot] wants to merge 1 commit intomasterfrom dependabot/nuget/src/Chinchilla.Serializers.Protobuf.Specifications/Google.Protobuf-3.15.0
+2-2
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