Update php tool constraint to v8

| datasource      | package                    | from   | to    |
| --------------- | -------------------------- | ------ | ----- |
| github-releases | containerbase/php-prebuild | 7.4.33 | 8.5.6 |


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

Author: renovate[bot]

renovate.json

@@ -5,6 +5,6 @@
     ],
     "constraints": {
         "composer": "^2.2",
-        "php": "^7.4"
+        "php": "^8.0"
     }
 }