upgrade asottile/workflows (#15)

Committed via https://github.com/asottile/all-repos

Author: asottile

.github/workflows/main.yml

@@ -7,11 +7,11 @@ on:
 
 jobs:
   main:
-    uses: asottile/workflows/.github/workflows/tox.yml@v1.5.0
+    uses: asottile/workflows/.github/workflows/tox.yml@v1.6.0
     with:
       env: '["py38", "py39", "py310", "py311", "py312", "py313", "pypy3"]'
   main-win:
-    uses: asottile/workflows/.github/workflows/tox.yml@v1.5.0
+    uses: asottile/workflows/.github/workflows/tox.yml@v1.6.0
     with:
       env: '["py38"]'
       os: windows-latest