fix: download phpDocumentor phar in workflow instead of composer dep

phpdocumentor/shim cannot be installed across the test matrix's older
PHP versions, so keep composer.json untouched and have the docs
workflow fetch the latest phpDocumentor.phar directly.

Author: splitbrain

.github/workflows/apigen.yml

@@ -20,11 +20,13 @@ jobs:
         with:
           php-version: '8.4'
 
-      - name: Install dependencies
-        run: composer install --no-interaction --no-progress
+      - name: Download phpDocumentor
+        run: |
+          curl -fsSL -o phpDocumentor.phar https://phpdoc.org/phpDocumentor.phar
+          chmod +x phpDocumentor.phar
 
       - name: Generate API docs
-        run: composer docs
+        run: php phpDocumentor.phar -d src -t docs --no-interaction
 
       - name: Deploy to GitHub Pages
         uses: peaceiris/actions-gh-pages@v4

composer.json

@@ -24,20 +24,11 @@
     "psr/log": "Allows you to make the CLI available as PSR-3 logger"
   },
   "require-dev": {
-    "phpunit/phpunit": "^8",
-    "phpdocumentor/shim": "^3"
+    "phpunit/phpunit": "^8"
   },
   "autoload": {
     "psr-4": {
       "splitbrain\\phpcli\\": "src"
     }
-  },
-  "scripts": {
-    "docs": "phpdoc -d src -t docs --no-interaction"
-  },
-  "config": {
-    "allow-plugins": {
-      "phpdocumentor/shim": true
-    }
   }
 }