[openstreetmap/openstreetmap-website] Bump bootstrap from 4.5.2 to 4.5.3 (#2941)

[dependabot[bot]]

Bumps [bootstrap](https://github.com/twbs/bootstrap-rubygem) from 4.5.2 to 4.5.3.
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://github.com/twbs/bootstrap-rubygem/commit/5d6148a6af1432c30de7b3fcf3bac312b07c83c9"><code>5d6148a</code></a> Bump to v4.5.3</li>
<li><a href="https://github.com/twbs/bootstrap-rubygem/commit/7de6796e7e34b07ef37171a41edce55a584c20cc"><code>7de6796</code></a> rake update[v4.5.3]</li>
<li>See full diff in <a href="https://github.com/twbs/bootstrap-rubygem/compare/v4.5.2...v4.5.3">compare view</a></li>
</ul>
</details>
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</details>
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/2941

-- Commit Summary --

  * Bump bootstrap from 4.5.2 to 4.5.3

-- File Changes --

    M Gemfile.lock (6)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/2941.patch
https://github.com/openstreetmap/openstreetmap-website/pull/2941.diff

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