Bump pest from 2.7.3 to 2.7.5 (#63)

Bumps [pest](https://github.com/pest-parser/pest) from 2.7.3 to 2.7.5.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/pest-parser/pest/commit/ab70fe68c58be6acf0ce892726da37a147226971"><code>ab70fe6</code></a>
Use Rust 2018 format for crates (<a
href="https://redirect.github.com/pest-parser/pest/issues/941">#941</a>)</li>
<li><a
href="https://github.com/pest-parser/pest/commit/5d30733b0a094da36c7376f90c3bf9c4fc0119e7"><code>5d30733</code></a>
update unicode to 15.1 (<a
href="https://redirect.github.com/pest-parser/pest/issues/936">#936</a>)</li>
<li><a
href="https://github.com/pest-parser/pest/commit/857d9f61c3d03d5699338c5c625ba8a2b5bf608f"><code>857d9f6</code></a>
Create SECURITY.md</li>
<li><a
href="https://github.com/pest-parser/pest/commit/04033e5d341d7758b3af2a33c382eeeac93bc864"><code>04033e5</code></a>
ci: fix cargo-msrv installation (<a
href="https://redirect.github.com/pest-parser/pest/issues/929">#929</a>)</li>
<li><a
href="https://github.com/pest-parser/pest/commit/a693e52b3589805396f226666cbef432014e47d4"><code>a693e52</code></a>
add a comment to EOL (<a
href="https://redirect.github.com/pest-parser/pest/issues/926">#926</a>)</li>
<li><a
href="https://github.com/pest-parser/pest/commit/8799c8ec1b08ff678f535437a497962b2ee26dfd"><code>8799c8e</code></a>
Update pest_derive to generate a list of all rules in Rule::all_rules().
(<a
href="https://redirect.github.com/pest-parser/pest/issues/927">#927</a>)</li>
<li><a
href="https://github.com/pest-parser/pest/commit/d2e25252ba33185d749a4f4e888308a8b6ee816d"><code>d2e2525</code></a>
bump MSRV to 1.61 (due to memchr's MSRV) (<a
href="https://redirect.github.com/pest-parser/pest/issues/925">#925</a>)</li>
<li><a
href="https://github.com/pest-parser/pest/commit/9045694bd27c710a9a373f53196c949795ff0b33"><code>9045694</code></a>
Add clarification to the docs (<a
href="https://redirect.github.com/pest-parser/pest/issues/924">#924</a>)</li>
<li>See full diff in <a
href="https://github.com/pest-parser/pest/compare/v2.7.3...v2.7.5">compare
view</a></li>
</ul>
</details>
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