Remove ${{ }} syntax in if statements

Noticed an error when this action was run even though the actor wasnt
matching. According to actions/runner#1173,
you should be really careful when using ${{ }} inside if statements.

.github/workflows/dependabot_pr_to_linear_issue.yml

@@ -24,13 +24,13 @@ jobs:
   dependabot-pr-to-linear-issue:
     name: "Dependabot PR to Linear issue"
     runs-on: ubuntu-latest
-    if: github.event_name == 'pull_request' && github.event.action == 'opened' && github.actor == ${{ inputs.actor }}
+    if: github.event_name == 'pull_request' && github.event.action == 'opened' && github.actor == inputs.actor
     steps:
       - name: Checkout
         uses: actions/checkout@v3
 
       - name: Create issue
-        uses: whereby/github-actions/.github/actions/create-linear-issue@main
+        uses: whereby/github-actions/.github/actions/create-linear-issue@1.0.0
         with:
           api-key: ${{ secrets.linear_api_key }}
           team-id: ${{ inputs.linear_team_id }}