don't run try-runtime devnet or testnet on hotfix PRs

Author: sam0x17

.github/workflows/try-runtime.yml

@@ -9,6 +9,7 @@ env:
 jobs:
   check-devnet:
     name: check devnet
+    if: github.base_ref != 'main'
     runs-on: SubtensorCI
     steps:
       - name: Checkout sources
@@ -29,7 +30,7 @@ jobs:
 
   check-testnet:
     name: check testnet
-    # if: github.base_ref == 'testnet' || github.base_ref == 'devnet' || github.base_ref == 'main'
+    if: github.base_ref != 'main'
     runs-on: SubtensorCI
     steps:
       - name: Checkout sources