fix(deps): update website dependencies

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
docusaurus-plugin-typedoc-api	^2.3.0 -> ^2.4.0
mermaid	8.11.5 -> 8.14.0

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[renovate]

⚠ Artifact update problem

Renovate failed to update an artifact related to this branch. You probably do not want to merge this PR as-is.

♻ Renovate will retry this branch, including artifacts, only when one of the following happens:

• any of the package files in this branch needs updating, or
• the branch becomes conflicted, or
• you click the rebase/retry checkbox if found above, or
• you rename this PR's title to start with "rebase!" to trigger it manually

The artifact failure details are included below:

File name: documentation/serenity-js.org/package-lock.json

lerna notice cli v5.4.3
lerna verb rootPath /mnt/renovate/gh/serenity-js/serenity-js
lerna notice cli v5.4.3
lerna verb rootPath /mnt/renovate/gh/serenity-js/serenity-js
lerna verb hoist using globs ["**","!@types/jasmine","!@types/mocha","!@types/cucumber","!@cucumber/create-meta","!@cucumber/cucumber","!@cucumber/messages","!@wdio/*","!cucumber","!colors","!express","!jasmine","!mocha","!protractor","!selenium-webdriver","!webdriverio"]
lerna info Bootstrapping 51 packages
lerna info Installing external dependencies
lerna verb actions 50 actions, concurrency 1
lerna info hoist Installing hoisted dependencies into root
lerna ERR! npm install --ignore-scripts --ignore-scripts --no-audit --package-lock-only exited 1 in 'serenity-js-monorepo'
lerna ERR! npm install --ignore-scripts --ignore-scripts --no-audit --package-lock-only stderr:
npm ERR! code ERESOLVE
npm ERR! ERESOLVE unable to resolve dependency tree
npm ERR! 
npm ERR! While resolving: serenity-js-monorepo@3.0.0-monorepo
npm ERR! Found: mermaid@8.14.0
npm ERR! node_modules/mermaid
npm ERR!   mermaid@"8.14.0" from the root project
npm ERR! 
npm ERR! Could not resolve dependency:
npm ERR! peer mermaid@">= 8.11.0 < 8.12.0" from mdx-mermaid@1.2.3
npm ERR! node_modules/mdx-mermaid
npm ERR!   mdx-mermaid@"^1.2.3" 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.
npm ERR! 
npm ERR! See /tmp/renovate-cache/others/npm/eresolve-report.txt for a full report.

npm ERR! A complete log of this run can be found in:
npm ERR!     /tmp/renovate-cache/others/npm/_logs/2022-08-21T01_11_11_375Z-debug-0.log
lerna ERR! npm install --ignore-scripts --ignore-scripts --no-audit --package-lock-only exited 1 in 'serenity-js-monorepo'