upgrade asottile/workflows

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

Author: asottile

.github/workflows/main.yml

@@ -8,6 +8,6 @@ on:
 
 jobs:
   main:
-    uses: asottile/workflows/.github/workflows/tox.yml@v1.6.0
+    uses: asottile/workflows/.github/workflows/tox.yml@v1.8.1
     with:
       env: '["py39", "py310"]'