ci: swtich to ramsey composer action with matrix

.github/workflows/pipeline.yml

@@ -4,21 +4,23 @@ on: pull_request
 jobs:
   pipeline:
     runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        php: ['8.2', '8.3']
+        dependencies: ['lowest', 'highest']
     steps:
       - name: Checkout
         uses: actions/checkout@v4
 
       - name: Setup PHP
         uses: shivammathur/setup-php@v2
         with:
-          php-version: '8.2'
+          php-version: ${{ matrix.php }}
 
-      - name: Cache Vendors
-        uses: actions/cache@v4
-        id: cache-vendors
+      - name: Install Composer
+        uses: "ramsey/composer-install@v3"
         with:
-          path: vendor
-          key: ${{ runner.os }}-vendor-${{ hashFiles('**/composer.lock') }}
+          dependency-versions: "${{ matrix.dependencies }}"
 
       - name: Composer Validation
         run: composer validate --strict

src/Store/ChromaDb/Store.php

@@ -36,7 +36,7 @@ public function addDocuments(array $documents): void
                 $this->logger->warning('Document {id} does not have a vector', ['id' => $document->id]);
             }
 
-            $ids[] = $document->id->toString();
+            $ids[] = (string) $document->id;
             $vectors[] = $document->vector->getData();
             $metadata[] = $document->metadata->getArrayCopy();
         }