Bump vue-template-compiler from 2.5.21 to 2.5.22 (#229)

Bumps [vue-template-compiler](https://github.com/vuejs/vue) from 2.5.21 to 2.5.22.
<details>
<summary>Release notes</summary>

*Sourced from [vue-template-compiler's releases](https://github.com/vuejs/vue/releases).*

> ## v2.5.22
> ### Bug Fixes
> 
> * **async component:** memory leak after synchronous async loading ([#9275](https://github-redirect.dependabot.com/vuejs/vue/issues/9275)) d21e931, closes [#9275](https://github-redirect.dependabot.com/vuejs/vue/issues/9275) [#9229](https://github-redirect.dependabot.com/vuejs/vue/issues/9229)
> * **core:** dedupe lifecycle hooks during options merge 0d2e9c4, closes [#9199](https://github-redirect.dependabot.com/vuejs/vue/issues/9199)
> * **core:** fix merged twice bug when passing extended constructor to mixins ([#9199](https://github-redirect.dependabot.com/vuejs/vue/issues/9199)) 743edac, closes [#9199](https://github-redirect.dependabot.com/vuejs/vue/issues/9199) [#9198](https://github-redirect.dependabot.com/vuejs/vue/issues/9198)
> * **ssr:** support rendering comment ([#9128](https://github-redirect.dependabot.com/vuejs/vue/issues/9128)) b06c784, closes [#9128](https://github-redirect.dependabot.com/vuejs/vue/issues/9128)
</details>
<details>
<summary>Commits</summary>

- [`99343f9`](vuejs/vue@99343f9) build: release 2.5.22
- [`06dbb2a`](vuejs/vue@06dbb2a) build: build 2.5.22
- [`7ac8f63`](vuejs/vue@7ac8f63) chore: remove residual files from dist
- [`0d2e9c4`](vuejs/vue@0d2e9c4) fix(core): dedupe lifecycle hooks during options merge
- [`743edac`](vuejs/vue@743edac) fix(core): fix merged twice bug when passing extended constructor to mixins (...
- [`d21e931`](vuejs/vue@d21e931) fix(async component): memory leak after synchronous async loading ([#9275](https://github-redirect.dependabot.com/vuejs/vue/issues/9275))
- [`cf42f8e`](vuejs/vue@cf42f8e) chore: update sponsors [ci skip] ([#9296](https://github-redirect.dependabot.com/vuejs/vue/issues/9296))
- [`75a2b4c`](vuejs/vue@75a2b4c) chore: update sponsors
- [`c117e8f`](vuejs/vue@c117e8f) chore: update backers
- [`38e967b`](vuejs/vue@38e967b) refactor: tiny cleanup changes ([#9193](https://github-redirect.dependabot.com/vuejs/vue/issues/9193))
- Additional commits viewable in [compare view](vuejs/vue@v2.5.21...v2.5.22)
</details>
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