fix github action pt 2

Author: crispheaney

.github/workflows/main.yml

@@ -22,7 +22,7 @@ jobs:
     runs-on: ubicloud
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v3
 
       - name: Install Solana Verify
         run: |
@@ -34,7 +34,7 @@ jobs:
           solana-verify build --library-name jit_proxy --base-image ellipsislabs/solana:1.16.6
 
       - name: Upload Artifact
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: build
           path: target/deploy/jit_proxy.so