Chore: Bump protobufjs and fabric-shim

Bumps [protobufjs](https://github.com/protobufjs/protobuf.js) to 7.6.0 and updates ancestor dependency [fabric-shim](https://github.com/hyperledger/fabric-chaincode-node). These dependencies need to be updated together.


Updates `protobufjs` from 7.4.0 to 7.6.0
- [Release notes](https://github.com/protobufjs/protobuf.js/releases)
- [Changelog](https://github.com/protobufjs/protobuf.js/blob/protobufjs-v7.6.0/CHANGELOG.md)
- [Commits](protobufjs/protobuf.js@protobufjs-v7.4.0...protobufjs-v7.6.0)

Updates `fabric-shim` from 2.4.2 to 2.5.8
- [Release notes](https://github.com/hyperledger/fabric-chaincode-node/releases)
- [Changelog](https://github.com/hyperledger/fabric-chaincode-node/blob/main/CHANGELOG.md)
- [Commits](hyperledger/fabric-chaincode-node@v2.4.2...v2.5.8)

---
updated-dependencies:
- dependency-name: protobufjs
  dependency-version: 7.6.0
  dependency-type: indirect
- dependency-name: fabric-shim
  dependency-version: 2.5.8
  dependency-type: direct:production
...

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Author: dependabot[bot]