fix: generate action not working (#26520)

* fix: remove pip script and try using default version 

Currently we are using this script, which is now throwing an error: https://bootstrap.pypa.io/pip/3.6/get-pip.py

* test python version

* fix spacing

* Update generate.yaml

* Update generate.yaml

* Update generate.yaml

* Update generate.yaml

* Update generate.yaml

* Update generate.yaml

* Update generate.yaml

Author: ldetmer

.github/workflows/generate.yaml

@@ -32,12 +32,14 @@ jobs:
           repository: googleapis/discovery-artifact-manager
           fetch-depth: 1
           path: discovery-artifact-manager
+      - uses: actions/setup-python@v5
+        with:
+          python-version: 3.8.18
       - run: |
           sudo apt update
-          sudo apt install python3
-          echo "using $(python3 --version)"
-          curl https://bootstrap.pypa.io/pip/3.6/get-pip.py -o get-pip.py
-          python3 get-pip.py
+          python3 --version
+          pip install pip==21.3.1
+          pip --version  
       - run: ./google-api-java-client-services/.github/workflows/generate.sh ${{ matrix.service }}
       - uses: googleapis/code-suggester@v2 # takes the changes from git directory
         env: