Run checks at a more random time, once a week.

Running early Thursday morning, to catch any errors from a new HomeAssistant
release on Wednesdays.

Unignore the wheels check, as the pre-requisites have been submitted.

.github/workflows/hacs-validate.yml

@@ -15,4 +15,3 @@ jobs:
         uses: 'hacs/action@main'
         with:
           category: 'integration'
-          ignore: 'wheels'

.github/workflows/hassfest-validate.yml

@@ -4,7 +4,7 @@ on:
   push:
   pull_request:
   schedule:
-    - cron: '0 0 * * *'
+    - cron: '1 18 * * THU'
 
 jobs:
   validate: