Try using mise action to ensure py3.11 is used for reqs update

Author: AndydeCleyre

Diff for: .github/workflows/reqs.yml

@@ -12,6 +12,8 @@ jobs:
         with:
           ref: develop
 
+      - uses: jdx/mise-action@v2
+
       - name: hit it
         run: ./mk/reqs.sh
 

Diff for: mise.toml

@@ -0,0 +1,2 @@
+[tools]
+python = "3.11"