Use Python 3.10 everywhere

Author: tannewt

.github/workflows/build.yml

@@ -187,7 +187,7 @@ jobs:
     - name: Set up python
       uses: actions/setup-python@v4
       with:
-        python-version: "3.x"
+        python-version: "3.10"
         cache: 'pip'
         cache-dependency-path: |
           requirements-ci.txt
@@ -245,7 +245,7 @@ jobs:
     - name: Set up python
       uses: actions/setup-python@v4
       with:
-        python-version: "3.x"
+        python-version: "3.10"
         cache: 'pip'
         cache-dependency-path: |
           requirements-ci.txt
@@ -319,7 +319,7 @@ jobs:
     - name: Set up python
       uses: actions/setup-python@v4
       with:
-        python-version: "3.x"
+        python-version: "3.10"
         cache: 'pip'
         cache-dependency-path: |
           requirements-ci.txt
@@ -563,7 +563,7 @@ jobs:
     - name: Set up python
       uses: actions/setup-python@v4
       with:
-        python-version: "3.x"
+        python-version: "3.10"
         cache: 'pip'
         cache-dependency-path: |
           requirements-ci.txt