Fix URL validation to only accept HTTP/HTTPS schemes for Ollama embeddings

- Update _validate_url() to restrict schemes to 'http' and 'https' only
- Fixes CI test failures for ftp://invalid-scheme test cases
- Maintains security by preventing non-web protocols

Co-Authored-By: João <joao@crewai.com>

src/crewai/utilities/embedding_configurator.py

@@ -93,7 +93,7 @@ class EmbeddingConfigurator:
 
     @staticmethod
     def _validate_url(url):
-        """Validate that a URL is properly formatted."""
+        """Validate that a URL is properly formatted and uses HTTP/HTTPS scheme."""
         if not url:
             return False
         
@@ -101,7 +101,10 @@ class EmbeddingConfigurator:
         
         try:
             result = urlparse(url)
-            return all([result.scheme, result.netloc])
+            return all([
+                result.scheme in ('http', 'https'),
+                result.netloc
+            ])
         except ValueError:
             return False