chore(deps-dev): Bump psalm/phar from 6.7.1 to 6.15.1

Bumps [psalm/phar](https://github.com/psalm/phar) from 6.7.1 to 6.15.1.
- [Release notes](https://github.com/psalm/phar/releases)
- [Commits](psalm/phar@6.7.1...6.15.1)

---
updated-dependencies:
- dependency-name: psalm/phar
  dependency-version: 6.15.1
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

composer.json

@@ -18,7 +18,7 @@
 	"require-dev": {
 		"nextcloud/ocp": "dev-master",
 		"roave/security-advisories": "dev-latest",
-		"psalm/phar": "6.7.x",
+		"psalm/phar": "6.15.1",
 		"nextcloud/coding-standard": "^1.1",
 		"friendsofphp/php-cs-fixer": "3.94.1"
 	},