Tests: Make PHPstan run in 8.2, 8.3 & 8.4 (#1072)

* Add PHP [8.2,8.3,8.4] matrices to `phpstan`

* Use a pointer with `unset($this)` to make PHP 8.4 happy

.github/workflows/lint.yaml

@@ -32,14 +32,31 @@ jobs:
   phpstan:
     name: PHPStan
     runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        php: [8.2, 8.3, 8.4]
     steps:
       - name: Code Checkout
         uses: actions/checkout@v4
 
+      - name: Get cache directory
+        id: composer-cache
+        run: |
+          echo "dir=$(composer config cache-files-dir)" >> $GITHUB_OUTPUT
+
+      - name: Cache
+        uses: actions/cache@v4
+        with:
+          path: ${{ steps.composer-cache.outputs.dir }}
+          key: ${{ runner.os }}-composer-${{ matrix.php }}-${{ hashFiles('**/composer.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-composer-${{ matrix.php }}-
+
       - name: Setup PHP
         uses: shivammathur/setup-php@v2
         with:
-          php-version: "8.3"
+          php-version: ${{ matrix.php }}
           extensions: bcmath, curl, gd, mbstring, mysql, openssl, pdo, tokenizer, xml, zip
           tools: composer:v2
           coverage: none

app/Extensions/Backups/BackupManager.php

@@ -156,8 +156,9 @@ class BackupManager
      */
     public function forget(array|string $adapter): self
     {
+        $adapters = &$this->adapters;
         foreach ((array) $adapter as $adapterName) {
-            unset($this->adapters[$adapterName]);
+            unset($adapters[$adapterName]);
         }
 
         return $this;

app/Livewire/AlertBannerContainer.php

@@ -26,7 +26,8 @@ class AlertBannerContainer extends Component
 
     public function remove(string $id): void
     {
-        unset($this->alertBanners[$id]);
+        $alertBanners = &$this->alertBanners;
+        unset($alertBanners[$id]);
     }
 
     public function render(): View