Update dependency phpstan/phpstan to ^1.10.21 (#146)

[![Mend
Renovate](https://app.renovatebot.com/images/banner.svg)](https://renovatebot.com)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [phpstan/phpstan](https://github.com/phpstan/phpstan) | require-dev
| patch | `^1.10.20` -> `^1.10.21` |

---

### Release Notes

<details>
<summary>phpstan/phpstan</summary>

###
[`v1.10.21`](https://github.com/phpstan/phpstan/releases/tag/1.10.21)

[Compare
Source](https://github.com/phpstan/phpstan/compare/1.10.20...1.10.21)

# Bugfixes 🐛

- Fix defining variables in match condition
(phpstan/phpstan-src@d6c2752),
[#&#8203;9474](https://github.com/phpstan/phpstan/issues/9474)
- Fix UnusedClosureUsesRule for already traversed match
(phpstan/phpstan-src@a719486),
[phpstan/phpstan-phpunit#190,
[#&#8203;9478](https://github.com/phpstan/phpstan/issues/9478)
- Update BetterReflection
(phpstan/phpstan-src@a540e44),
[#&#8203;9477](https://github.com/phpstan/phpstan/issues/9477)
- Fix newInstance on ReflectionAttribute adapter with enum argument
(ondrejmirtes/BetterReflection@277b960)

# Internals 🔍

- Cheap checks first in ObjectType
([#&#8203;2475](https://github.com/phpstan/phpstan-src/pull/2475)),
thanks [@&#8203;mad-briller](https://github.com/mad-briller)!

</details>

---

### Configuration

📅 **Schedule**: Branch creation - At any time (no schedule defined),
Automerge - At any time (no schedule defined).

🚦 **Automerge**: Enabled.

♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the
rebase/retry checkbox.

🔕 **Ignore**: Close this PR and you won't be reminded about this update
again.

---

- [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check
this box

---

This PR has been generated by [Mend
Renovate](https://www.mend.io/free-developer-tools/renovate/). View
repository job log
[here](https://developer.mend.io/github/Lendable/composer-license-checker).

<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiIzNS4xMzEuMCIsInVwZGF0ZWRJblZlciI6IjM1LjEzMS4wIiwidGFyZ2V0QnJhbmNoIjoibWFpbiJ9-->

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

composer.json

@@ -18,7 +18,7 @@
     "require-dev": {
         "ergebnis/composer-normalize": "^2.31.0",
         "php-cs-fixer/shim": "^3.18.0",
-        "phpstan/phpstan": "^1.10.20",
+        "phpstan/phpstan": "^1.10.21",
         "phpstan/phpstan-deprecation-rules": "^1.1.3",
         "phpstan/phpstan-phpunit": "^1.3.13",
         "phpstan/phpstan-strict-rules": "^1.5.1",