Update typedoc from 0.21.2 to ^0.23.7.

[kaibolay]

This should fix:

$ npm run build:pack

> firebase-functions@3.22.0 build:pack
> rm -rf lib && npm install && tsc -p tsconfig.release.json && npm pack

npm ERR! code ERESOLVE
npm ERR! ERESOLVE could not resolve
npm ERR! 
npm ERR! While resolving: typedoc@0.21.2
npm ERR! Found: typescript@4.6.3
npm ERR! node_modules/typescript
npm ERR!   dev typescript@"^4.3.5" from the root project
npm ERR!   typescript@"~4.6.3" from @microsoft/api-extractor@7.23.0
npm ERR!   node_modules/@microsoft/api-extractor
npm ERR!     dev @microsoft/api-extractor@"^7.18.7" from the root project
npm ERR!   4 more (ts-node, tslint, tsutils, tsutils)
npm ERR! 
npm ERR! Could not resolve dependency:
npm ERR! peer typescript@"4.0.x || 4.1.x || 4.2.x || 4.3.x" from typedoc@0.21.2
npm ERR! node_modules/typedoc
npm ERR!   dev typedoc@"0.21.2" from the root project
npm ERR! 
npm ERR! Conflicting peer dependency: typescript@4.3.5
npm ERR! node_modules/typescript
npm ERR!   peer typescript@"4.0.x || 4.1.x || 4.2.x || 4.3.x" from typedoc@0.21.2
npm ERR!   node_modules/typedoc
npm ERR!     dev typedoc@"0.21.2" from the root project
npm ERR! 
npm ERR! Fix the upstream dependency conflict, or retry
npm ERR! this command with --force, or --legacy-peer-deps
npm ERR! to accept an incorrect (and potentially broken) dependency resolution.

[kaibolay]

This issue is addressed with #1170