Bump the tools_phpstan_dependencies group across 1 directory with 3 updates

Bumps the tools_phpstan_dependencies group with 3 updates in the /tools/02_phpstan directory: [phpstan/phpstan](https://github.com/phpstan/phpstan), [phpstan/phpstan-deprecation-rules](https://github.com/phpstan/phpstan-deprecation-rules) and [phpstan/phpstan-symfony](https://github.com/phpstan/phpstan-symfony).


Updates `phpstan/phpstan` from 2.1.14 to 2.1.15
- [Release notes](https://github.com/phpstan/phpstan/releases)
- [Changelog](https://github.com/phpstan/phpstan/blob/2.1.x/CHANGELOG.md)
- [Commits](phpstan/phpstan@2.1.14...2.1.15)

Updates `phpstan/phpstan-deprecation-rules` from 2.0.2 to 2.0.3
- [Release notes](https://github.com/phpstan/phpstan-deprecation-rules/releases)
- [Commits](phpstan/phpstan-deprecation-rules@2.0.2...2.0.3)

Updates `phpstan/phpstan-symfony` from 2.0.4 to 2.0.6
- [Release notes](https://github.com/phpstan/phpstan-symfony/releases)
- [Commits](phpstan/phpstan-symfony@2.0.4...2.0.6)

---
updated-dependencies:
- dependency-name: phpstan/phpstan
  dependency-version: 2.1.15
  dependency-type: direct:development
  update-type: version-update:semver-patch
  dependency-group: tools_phpstan_dependencies
- dependency-name: phpstan/phpstan-deprecation-rules
  dependency-version: 2.0.3
  dependency-type: direct:development
  update-type: version-update:semver-patch
  dependency-group: tools_phpstan_dependencies
- dependency-name: phpstan/phpstan-symfony
  dependency-version: 2.0.6
  dependency-type: direct:development
  update-type: version-update:semver-patch
  dependency-group: tools_phpstan_dependencies
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

tools/02_phpstan/composer.json

@@ -6,10 +6,10 @@
 		"php": "^8.4.0"
 	},
 	"require-dev": {
-		"phpstan/phpstan": "2.1.14",
-		"phpstan/phpstan-deprecation-rules": "2.0.2",
+		"phpstan/phpstan": "2.1.15",
+		"phpstan/phpstan-deprecation-rules": "2.0.3",
 		"phpstan/phpstan-phpunit": "2.0.6",
-		"phpstan/phpstan-symfony": "2.0.4",
+		"phpstan/phpstan-symfony": "2.0.6",
 		"roave/security-advisories": "dev-latest"
 	},
 	"config": {