chore(test): add python 3.10 into github actions (#1160)

* add python 3.10 into github actions

* update param to string to prevent github trimming

.github/workflows/kfp-tekton-unittests.yml

@@ -16,7 +16,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [3.7, 3.8, 3.9]
+        python-version: ['3.7', '3.8', '3.9', '3.10']
     steps:
       - uses: actions/checkout@v2
       - name: Set up Python ${{ matrix.python-version }}
@@ -35,10 +35,10 @@ jobs:
         with:
           go-version: 1.19.x
       - uses: actions/checkout@v2
-      - name: Set up Python 3.7
+      - name: Set up Python 3.8
         uses: actions/setup-python@v2
         with:
-          python-version: 3.7
+          python-version: 3.8
       - name: Install dependencies
         run: python -m pip install -e sdk/python
       - name: "Generate testdata yaml files."
@@ -53,10 +53,10 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v2
-    - name: Set up Python 3.7
+    - name: Set up Python 3.8
       uses: actions/setup-python@v2
       with:
-        python-version: 3.7
+        python-version: 3.8
     - name: Install dependencies
       run: python -m pip install -e sdk/python
     - name: "Progress report on compiling KFP DSL test scripts"
@@ -65,10 +65,10 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v2
-    - name: Set up Python 3.7
+    - name: Set up Python 3.8
       uses: actions/setup-python@v2
       with:
-        python-version: 3.7
+        python-version: 3.8
     - name: "Lint Python code with flake8"
       run: VENV=$VIRTUAL_ENV make lint
   check-license: