Fix CI: Use uv venv to avoid --system installation issues

Amp-Thread-ID: https://ampcode.com/threads/T-1f1f15f6-c4ef-4e6e-896a-67a085d602b0
Co-authored-by: Amp <[email protected]>

Author: vinitkumar

.github/workflows/pythonpackage.yml

@@ -63,8 +63,9 @@ jobs:
 
     - name: Install dependencies
       run: |
-        uv pip install --system -e .
-        uv pip install --system pytest pytest-xdist pytest-cov
+        uv venv
+        uv pip install -e .
+        uv pip install pytest pytest-xdist pytest-cov
 
     - name: Create coverage directory
       run: mkdir -p coverage/reports
@@ -114,7 +115,8 @@ jobs:
 
     - name: Install dependencies
       run: |
-        uv pip install --system -e .
+        uv venv
+        uv pip install -e .
 
     - name: Run ruff
       run: uvx ruff check json2xml tests