fix matrix installing python 3.1

Author: bmos

.github/workflows/python-checks.yml

@@ -19,11 +19,11 @@ jobs:
       fail-fast: false
       matrix:
         python-version:
-          - 3.9
-          - 3.10
-          - 3.11
-          - 3.12
-          - 3.13
+          - '3.9'
+          - '3.10'
+          - '3.11'
+          - '3.12'
+          - '3.13'
         os:
           - ubuntu-latest
           - windows-latest
@@ -287,11 +287,11 @@ jobs:
       fail-fast: false
       matrix:
         python-version:
-          - 3.9
-          - 3.10
-          - 3.11
-          - 3.12
-          - 3.13
+          - '3.9'
+          - '3.10'
+          - '3.11'
+          - '3.12'
+          - '3.13'
         os:
           - ubuntu-latest
           - windows-latest