Bump protobuf from 3.18 to 3.18.3

[dependabot[bot]]

Bumps protobuf from 3.18 to 3.18.3.

Release notes

Sourced from protobuf's releases.

Protocol Buffers v3.18.3

C++

• Reduce memory consumption of MessageSet parsing
• This release addresses a Security Advisory for C++ and Python users

Protocol Buffers v3.18.2

Java

• Improve performance characteristics of UnknownFieldSet parsing (#9371)

Protocol Buffers v3.18.1

Python

• Update setup.py to reflect that we now require at least Python 3.5 (#8989)
• Performance fix for DynamicMessage: force GetRaw() to be inlined (#9023)

Ruby

• Update ruby_generator.cc to allow proto2 imports in proto3 (#9003)

Commits

• a902b39 No-op whitespace change
• ae62acd Updating version.json and repo version numbers to: 18.3
• f43ac49 Merge pull request #10542 from deannagarcia/3.18.x
• 9efdf55 Add missing includes
• d1635e1 Apply patch
• 5b37c91 Update version.json with "lts": true (#10534)
• c39d622 Merge pull request #10529 from protocolbuffers/deannagarcia-patch-5
• f77d3b6 Update version.json
• 8178b06 Merge pull request #10503 from deannagarcia/3.18.x
• 24ca839 Add version file
• Additional commits viewable in compare view

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