Log Message:
protobuf py-protobuf: updated to 3.18.0

Protocol Buffers v3.18.0

C++

Fix warnings raised by clang 11
Make StringPiece constructible from std::string_view
Add missing capability attributes for LLVM 12
Stop using std::iterator (deprecated in C++17).
Move field_access_listener from libprotobuf-lite to libprotobuf
Fix 7047 Safely handle setlocale
Remove deprecated version of SetTotalBytesLimit()
Support arena allocation of google::protobuf::AnyMetadata
Fix undefined symbol error around SharedCtor()
Fix default value of enum(int) in json_util with proto2
Better Smaller ByteSizeLong
Introduce event filters for inject_field_listener_events
Reduce memory usage of DescriptorPool
For lazy fields copy serialized form when allowed.
Re-introduce the InlinedStringField class
v2 access listener
Reduce padding in the proto's ExtensionRegistry map.
GetExtension performance optimizations
Make tracker a static variable rather than call static functions
Support extensions in field access listener
Annotate MergeFrom for field access listener
Fix incomplete types for field access listener
Add map_entry/new_map_entry to SpecificField in MessageDifferencer. They
record the map items which are different in MessageDifferencer's reporter.
Reduce binary size due to fieldless proto messages
TextFormat: ParseInfoTree supports getting field end location in addition to
start.
Fix repeated enum extension size in field listener
Enable Any Text Expansion for Descriptors::DebugString()
Switch from int{8,16,32,64} to int{8,16,32,64}_t

Python

Drops support for 2.7 and 3.5.