bump(deps): update dependency esbuild to ^0.15.18 (#265)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [esbuild](https://togithub.com/evanw/esbuild) | [`^0.15.17` ->
`^0.15.18`](https://renovatebot.com/diffs/npm/esbuild/0.15.17/0.15.18) |
[![age](https://badges.renovateapi.com/packages/npm/esbuild/0.15.18/age-slim)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://badges.renovateapi.com/packages/npm/esbuild/0.15.18/adoption-slim)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://badges.renovateapi.com/packages/npm/esbuild/0.15.18/compatibility-slim/0.15.17)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://badges.renovateapi.com/packages/npm/esbuild/0.15.18/confidence-slim/0.15.17)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

<details>
<summary>evanw/esbuild</summary>

###
[`v0.15.18`](https://togithub.com/evanw/esbuild/blob/HEAD/CHANGELOG.md#&#8203;01518)

[Compare
Source](https://togithub.com/evanw/esbuild/compare/v0.15.17...v0.15.18)

-   Performance improvements for both JS and CSS

This release brings noticeable performance improvements for JS parsing
and for CSS parsing and printing. Here's an example benchmark for using
esbuild to pretty-print a single large minified CSS file and JS file:

    | Test case      | Previous release | This release       |
    |----------------|------------------|--------------------|
    | 4.8mb CSS file | 19ms             | 11ms (1.7x faster) |
    | 5.8mb JS file  | 36ms             | 32ms (1.1x faster) |

    The performance improvements were very straightforward:

- Identifiers were being scanned using a generic character advancement
function instead of using custom inline code. Advancing past each
character involved UTF-8 decoding as well as updating multiple member
variables. This was sped up using loop that skips UTF-8 decoding
entirely and that only updates member variables once at the end. This is
faster because identifiers are plain ASCII in the vast majority of
cases, so Unicode decoding is almost always unnecessary.

- CSS identifiers and CSS strings were still being printed one character
at a time. Apparently I forgot to move this part of esbuild's CSS
infrastructure beyond the proof-of-concept stage. These were both very
obvious in the profiler, so I think maybe I have just never profiled
esbuild's CSS printing before?

- There was unnecessary work being done that was related to source maps
when source map output was disabled. I likely haven't observed this
before because esbuild's benchmarks always have source maps enabled.
This work is now disabled when it's not going to be used.

I definitely should have caught these performance issues earlier. Better
late than never I suppose.

</details>

---

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---

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