Update workflow python deps (#23568)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/release-dispatch.yml

@@ -43,7 +43,7 @@ permissions:
 env:
   # Default ddev version when callers don't pass `ddev-version`. Tracked by Renovate.
   # renovate: datasource=pypi depName=ddev
-  DEFAULT_DDEV_VERSION: "14.3.2"
+  DEFAULT_DDEV_VERSION: "16.0.0"
 
 jobs:
   prepare:

.github/workflows/test-release-scripts.yml

@@ -29,7 +29,7 @@ jobs:
           python-version: "3.13"
 
       - name: Install pytest
-        run: pip install pytest==8.3.5
+        run: pip install pytest==9.0.3
 
       - name: Run tests
         working-directory: .github/workflows/scripts