fix: public CI runners

Author: iamnp

.github/workflows/core_tests.yml

@@ -16,7 +16,7 @@ on:
 jobs:
   run-tests:
     name: Core repo tests in docker
-    runs-on: [voting-private-runners]
+    runs-on: [ubuntu-latest]
     timeout-minutes: 120
 
     services:

.github/workflows/normal_vote_ci.yml

@@ -12,7 +12,7 @@ on:
 jobs:
   run-tests-normal-1:
     name: Brownie fork NORMAL tests 1
-    runs-on: [voting-private-runners]
+    runs-on: [ubuntu-latest]
     timeout-minutes: 150
 
     services:
@@ -36,7 +36,7 @@ jobs:
 
   run-tests-normal-2:
     name: Brownie fork NORMAL tests 2
-    runs-on: [voting-private-runners]
+    runs-on: [ubuntu-latest]
     timeout-minutes: 150
 
     services: