Fix GitHub Actions to avoid externally managed Python error

- Remove --system flag from all uv pip install commands
- Use virtual environments properly in GitHub Actions
- Fix compatibility with externally managed Python environments
- Ensure workflows work on both local and CI environments
- Update all workflow files: pythonpackage.yml, publish-to-test-pypi.yml, publish-to-live-pypi.yml, lint.yml

Author: vinitkumar

.github/workflows/lint.yml

@@ -24,7 +24,7 @@ jobs:
           enable-cache: true
 
       - name: Install ruff
-        run: uv pip install --system ruff
+        run: uv pip install ruff
       - name: Run Ruff
         run: |
           ruff check json2xml
@@ -48,7 +48,7 @@ jobs:
           enable-cache: true
 
       - name: Install mypy and types
-        run: uv pip install --system mypy types-requests types-urllib3
+        run: uv pip install mypy types-requests types-urllib3
       - name: mypy
         uses: liskin/gh-problem-matcher-wrap@v2
         with:

.github/workflows/publish-to-live-pypi.yml

@@ -22,7 +22,7 @@ jobs:
         enable-cache: true
 
     - name: Install build dependencies
-      run: uv pip install --system build
+      run: uv pip install build
     - name: Build a binary wheel and a source tarball
       run: >-
         python -m

.github/workflows/publish-to-test-pypi.yml

@@ -23,7 +23,7 @@ jobs:
         enable-cache: true
 
     - name: Install build dependencies
-      run: uv pip install --system build
+      run: uv pip install build
     - name: Build a binary wheel and a source tarball
       run: >-
         python -m

.github/workflows/pythonpackage.yml

@@ -56,8 +56,8 @@ jobs:
 
     - name: Install dependencies
       run: |
-        uv pip install --system -e .
-        uv pip install --system pytest pytest-xdist pytest-cov
+        uv pip install -e .
+        uv pip install pytest pytest-xdist pytest-cov
 
     - name: Create coverage directory
       run: mkdir -p coverage/reports
@@ -107,8 +107,8 @@ jobs:
 
     - name: Install dependencies
       run: |
-        uv pip install --system -e .
-        uv pip install --system ruff>=0.3.0
+        uv pip install -e .
+        uv pip install ruff>=0.3.0
 
     - name: Run ruff
       run: ruff check json2xml tests
@@ -136,8 +136,8 @@ jobs:
 
     - name: Install dependencies
       run: |
-        uv pip install --system -e .
-        uv pip install --system mypy>=1.0.0 types-setuptools
+        uv pip install -e .
+        uv pip install mypy>=1.0.0 types-setuptools
 
     - name: Run mypy
       run: mypy json2xml tests
@@ -192,8 +192,8 @@ jobs:
 
     - name: Install dependencies
       run: |
-        uv pip install --system -e .
-        uv pip install --system pytest pytest-xdist pytest-cov
+        uv pip install -e .
+        uv pip install pytest pytest-xdist pytest-cov
 
     - name: Create coverage directory
       run: mkdir -p coverage/reports