Update dependency psalm/plugin-phpunit to ^0.20.0

| datasource | package              | from   | to     |
| ---------- | -------------------- | ------ | ------ |
| packagist  | psalm/plugin-phpunit | 0.19.7 | 0.20.1 |


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

Author: renovate[bot]

composer.json

@@ -34,7 +34,7 @@
         "amphp/socket": "^2.3.1",
         "laminas/laminas-coding-standard": "~3.1.0",
         "phpunit/phpunit": "^11.5.42",
-        "psalm/plugin-phpunit": "^0.19.0",
+        "psalm/plugin-phpunit": "^0.20.0",
         "sebastian/recursion-context": "^6.0.3",
         "vimeo/psalm": "^6.13.1"
     },