return to using main test branch repo for ghas

Author: Elizabeth Perl

.github/workflows/run-ss3-no-est.yml

@@ -38,7 +38,6 @@ jobs:
         uses: actions/checkout@v4
         with:
           repository: 'nmfs-ost/ss3-test-models'
-          ref: t-v-models-update
           path: test-models-repo
 
       - name: Update Ubuntu packages

.github/workflows/run-ss3-with-est.yml

@@ -34,7 +34,6 @@ jobs:
         uses: actions/checkout@v4
         with:
           repository: 'nmfs-ost/ss3-test-models'
-          ref: t-v-models-update
           path: test-models-repo
 
       - name: Update Ubuntu packages