fix: pin ruff to 0.15.22 in ci-python-sam and ci-python-app workflows (#88)

Unpinned pip install ruff let ruff 0.16.0 pick up expanded
default lint rules, breaking every caller repo without its
own ruff config. Pinning prevents implicit rule-set changes
on new ruff releases.

Refs: #87

Co-authored-by: amoussa1229 <166072409+amoussa1229@users.noreply.github.com>

.github/workflows/ci-python-app.yaml

@@ -61,7 +61,7 @@ jobs:
           python-version: ${{ inputs.python-version }}
 
       - name: Install ruff
-        run: pip install ruff
+        run: pip install 'ruff==0.15.22'
 
       - name: Ruff check
         run: ruff check ${{ inputs.source-dirs }}

.github/workflows/ci-python-sam.yaml

@@ -59,7 +59,7 @@ jobs:
           python-version: ${{ inputs.python-version }}
 
       - name: Install ruff
-        run: pip install ruff
+        run: pip install 'ruff==0.15.22'
 
       - name: Ruff check
         run: ruff check ${{ inputs.source-dirs }}