chore(deps): update dependency phpmd/phpmd to v2.15.0 (#551)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [phpmd/phpmd](https://phpmd.org/)
([source](https://togithub.com/phpmd/phpmd)) | `2.14.1` -> `2.15.0` |
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|
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|
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|

---

### Release Notes

<details>
<summary>phpmd/phpmd (phpmd/phpmd)</summary>

###
[`v2.15.0`](https://togithub.com/phpmd/phpmd/blob/HEAD/CHANGELOG#phpmd-2150-20231211)

[Compare
Source](https://togithub.com/phpmd/phpmd/compare/2.14.1...2.15.0)

\========================

- Added [#&#8203;1036](https://togithub.com/phpmd/phpmd/issues/1036)
\[CLI] Allow option and value separated with equal sign
-   Require pdepend/pdepend 2.16.1
- Support PHP 8.3
[pdepend/pdepend#699](https://togithub.com/pdepend/pdepend/issues/699)
- Support Symfony 7
[pdepend/pdepend#692](https://togithub.com/pdepend/pdepend/issues/692)
- Fixed
[pdepend/pdepend#691](https://togithub.com/pdepend/pdepend/issues/691)
Float parsing for number starting with 0.
- Fixed
[pdepend/pdepend#689](https://togithub.com/pdepend/pdepend/issues/689)
Handle conversion to/detection of UTF-8 encoding using either mbstring
PHP extension or the polyfill provided by Symfony
- Fixed
[pdepend/pdepend#687](https://togithub.com/pdepend/pdepend/issues/687)
Parsing the correct comment for method doc-block (Allow correct
SuppressWarnings annotation handling on PHPMD)
([https://github.com/phpmd/phpmd/issues/914](https://togithub.com/phpmd/phpmd/issues/914))
- Fixed
[pdepend/pdepend#694](https://togithub.com/pdepend/pdepend/issues/694)
Handle yield termination depending on context
([https://github.com/phpmd/phpmd/issues/804](https://togithub.com/phpmd/phpmd/issues/804))
- Fixed [#&#8203;1044](https://togithub.com/phpmd/phpmd/issues/1044)
strict option on applyOnClassMethods
- Documented
[#&#8203;1041](https://togithub.com/phpmd/phpmd/issues/1041) Mention
public key used for signing the Phars
- Documented
[#&#8203;1042](https://togithub.com/phpmd/phpmd/issues/1042) Document
installation with PHIVE

</details>

---

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composer.json

@@ -37,7 +37,7 @@
     "guzzlehttp/psr7": "^1.7 || ^2.0"
   },
   "require-dev": {
-    "phpmd/phpmd": "2.14.1",
+    "phpmd/phpmd": "2.15.0",
     "squizlabs/php_codesniffer": "3.7.2",
     "orchestra/testbench": "*",
     "guzzlehttp/guzzle": "^7.3",