Bump lodash from 4.17.19 to 4.17.21 in /cloudfunctions/bookinfo#5

Bumps [lodash](https://github.com/lodash/lodash) from 4.17.19 to 4.17.21. <details> <summary>Commits</summary> <ul> <li><a href="https://github.com/lodash/lodash/commit/f299b52f39486275a9e6483b60a410e06520c538"><code>f299b52</code></a> Bump to v4.17.21</li> <li><a href="https://github.com/lodash/lodash/commit/c4847ebe7d14540bb28a8b932a9ce1b9ecbfee1a"><code>c4847eb</code></a> Improve performance of <code>toNumber</code>, <code>trim</code> and <code>trimEnd</code> on large input strings</li> <li><a href="https://github.com/lodash/lodash/commit/3469357cff396a26c363f8c1b5a91dde28ba4b1c"><code>3469357</code></a> Prevent command injection through <code>_.template</code>'s <code>variable</code> option</li> <li><a href="https://github.com/lodash/lodash/commit/ded9bc66583ed0b4e3b7dc906206d40757b4a90a"><code>ded9bc6</code></a> Bump to v4.17.20.</li> <li><a href="https://github.com/lodash/lodash/commit/63150ef7645ac07961b63a86490f419f356429aa"><code>63150ef</code></a> Documentation fixes.</li> <li><a href="https://github.com/lodash/lodash/commit/00f0f62a979d2f5fa0287c06eae70cf9a62d8794"><code>00f0f62</code></a> test.js: Remove trailing comma.</li> <li><a href="https://github.com/lodash/lodash/commit/846e434c7a5b5692c55ebf5715ed677b70a32389"><code>846e434</code></a> Temporarily use a custom fork of <code>lodash-cli</code>.</li> <li><a href="https://github.com/lodash/lodash/commit/5d046f39cbd27f573914768e3b36eeefcc4f1229"><code>5d046f3</code></a> Re-enable Travis tests on <code>4.17</code> branch.</li> <li><a href="https://github.com/lodash/lodash/commit/aa816b36d402a1ad9385142ce7188f17dae514fd"><code>aa816b3</code></a> Remove <code>/npm-package</code>.</li> <li>See full diff in <a href="https://github.com/lodash/lodash/compare/4.17.19...4.17.21">compare view</a></li> </ul> </details> <details> <summary>Maintainer changes</summary> <p>This version was pushed to npm by <a href="https://www.npmjs.com/~bnjmnt4n">bnjmnt4n</a>, a new releaser for lodash since your current version.</p> </details> <br /> [](https://docs.github.com/en/github/managing-security-vulnerabilities/about-dependabot-security-updates#about-compatibility-scores) Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting `@dependabot rebase`. [//]: # (dependabot-automerge-start) [//]: # (dependabot-automerge-end) --- <details> <summary>Dependabot commands and options</summary> <br /> You can trigger Dependabot actions by commenting on this PR: - `@dependabot rebase` will rebase this PR - `@dependabot recreate` will recreate this PR, overwriting any edits that have been made to it - `@dependabot merge` will merge this PR after your CI passes on it - `@dependabot squash and merge` will squash and merge this PR after your CI passes on it - `@dependabot cancel merge` will cancel a previously requested merge and block automerging - `@dependabot reopen` will reopen this PR if it is closed - `@dependabot close` will close this PR and stop Dependabot recreating it. You can achieve the same result by closing it manually - `@dependabot ignore this major version` will close this PR and stop Dependabot creating any more for this major version (unless you reopen the PR or upgrade to it yourself) - `@dependabot ignore this minor version` will close this PR and stop Dependabot creating any more for this minor version (unless you reopen the PR or upgrade to it yourself) - `@dependabot ignore this dependency` will close this PR and stop Dependabot creating any more for this dependency (unless you reopen the PR or upgrade to it yourself) - `@dependabot use these labels` will set the current labels as the default for future PRs for this repo and language - `@dependabot use these reviewers` will set the current reviewers as the default for future PRs for this repo and language - `@dependabot use these assignees` will set the current assignees as the default for future PRs for this repo and language - `@dependabot use this milestone` will set the current milestone as the default for future PRs for this repo and language You can disable automated security fix PRs for this repo from the [Security Alerts page](https://github.com/Volcano-Yang/BOOK-MANAGER/network/alerts). </details>