fix: correct python-version to string instead of float, misleading the ci.

Author: Tyskiep99

.github/workflows/build.yml

@@ -12,7 +12,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: [ 3.6, 3.7, 3.8, 3.9, 3.10 ]
+        python-version: [ '3.6', '3.7', '3.8', '3.9', '3.10' ]
         os: [ ubuntu-18.04, macOS-latest, windows-latest ]
 
     steps: