chore(deps): bump @solana/web3.js from 1.91.0 to 1.91.6 in /webapp

Bumps [@solana/web3.js](https://github.com/solana-labs/solana-web3.js) from 1.91.0 to 1.91.6.
- [Release notes](https://github.com/solana-labs/solana-web3.js/releases)
- [Commits](solana-labs/solana-web3.js@v1.91.0...v1.91.6)

---
updated-dependencies:
- dependency-name: "@solana/web3.js"
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <support@github.com>