Install peft from main for CI tests with dev dependencies (#4250)

Author: albertvillanova

.github/workflows/tests.yml

@@ -129,7 +129,7 @@ jobs:
           uv pip install -U git+https://github.com/huggingface/accelerate.git
           uv pip install -U git+https://github.com/huggingface/datasets.git
           uv pip install -U git+https://github.com/huggingface/transformers.git
-          
+          uv pip install -U git+https://github.com/huggingface/peft.git
 
       - name: Test with pytest
         run: |