fix: remove secrets expression from action.yml input description (invalid in action metadata)

Author: IPDataInfo

action.yml

@@ -15,8 +15,8 @@ inputs:
     required: true
   api_key:
     description: >-
-      Optional ipdata.info API key (recommended: pass via secrets, e.g.
-      ${{ secrets.IPDATA_API_KEY }}). Omit for free-tier anonymous lookups.
+      Optional ipdata.info API key. Recommended to pass it from a repository
+      secret via the workflow. Omit for free-tier anonymous lookups.
     required: false
     default: ''
   host: