build(deps): bump tslib from 2.8.0 to 2.8.1 (#484)

Bumps [tslib](https://github.com/Microsoft/tslib) from 2.8.0 to 2.8.1.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/Microsoft/tslib/releases">tslib's
releases</a>.</em></p>
<blockquote>
<h2>v2.8.1</h2>
<h2>What's Changed</h2>
<ul>
<li>Fix publish workflow by <a
href="https://github.com/andrewbranch"><code>@​andrewbranch</code></a>
in <a
href="https://redirect.github.com/microsoft/tslib/pull/271">microsoft/tslib#271</a></li>
<li>Include non-enumerable keys in __importStar helper by <a
href="https://github.com/rbuckton"><code>@​rbuckton</code></a> in <a
href="https://redirect.github.com/microsoft/tslib/pull/272">microsoft/tslib#272</a></li>
<li>Remove use of ES2015 syntax by <a
href="https://github.com/andrewbranch"><code>@​andrewbranch</code></a>
in <a
href="https://redirect.github.com/microsoft/tslib/pull/275">microsoft/tslib#275</a></li>
</ul>
<p><strong>Full Changelog</strong>: <a
href="https://github.com/microsoft/tslib/compare/v2.8.0...v2.8.1">https://github.com/microsoft/tslib/compare/v2.8.0...v2.8.1</a></p>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/microsoft/tslib/commit/d72d6f70b36286bc3f94a3dda1e64dcb568b1370"><code>d72d6f7</code></a>
2.8.1</li>
<li><a
href="https://github.com/microsoft/tslib/commit/11fa98227b6680aca0ee1d6dd3d613699672957d"><code>11fa982</code></a>
Merge pull request <a
href="https://redirect.github.com/Microsoft/tslib/issues/275">#275</a>
from microsoft/bug/es5-compat</li>
<li><a
href="https://github.com/microsoft/tslib/commit/3c532ebb15fabac8fb8b6bc08704283c1ce0fad0"><code>3c532eb</code></a>
Remove use of ES2015 syntax</li>
<li><a
href="https://github.com/microsoft/tslib/commit/b0076c4070f7bae5730b49903529d8b27bc43e96"><code>b0076c4</code></a>
Include non-enumerable keys in __importStar helper (<a
href="https://redirect.github.com/Microsoft/tslib/issues/272">#272</a>)</li>
<li><a
href="https://github.com/microsoft/tslib/commit/7c11588c364da4267328cfd32ed20de57494db67"><code>7c11588</code></a>
Add missing registry-url parameter</li>
<li><a
href="https://github.com/microsoft/tslib/commit/1fec6679a21ab68bf4519551e76503f2602d6f3c"><code>1fec667</code></a>
Merge pull request <a
href="https://redirect.github.com/Microsoft/tslib/issues/271">#271</a>
from microsoft/fix-publish</li>
<li><a
href="https://github.com/microsoft/tslib/commit/097e99eae872e743dda18aaee034118fb9c7c063"><code>097e99e</code></a>
Fix publish workflow</li>
<li>See full diff in <a
href="https://github.com/Microsoft/tslib/compare/v2.8.0...v2.8.1">compare
view</a></li>
</ul>
</details>
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