fix: use ubuntu 20.04 for wider target support

Author: nhtyy

.github/workflows/ci.yml

@@ -14,7 +14,7 @@ jobs:
             triple: aarch64-apple-darwin
           - os: macos-13
             triple: x86_64-apple-darwin
-          - os: buildjet-32vcpu-ubuntu-2204
+          - os: buildjet-32vcpu-ubuntu-2004
             triple: x86_64-unknown-linux-gnu
           - os: buildjet-32vcpu-ubuntu-2204-arm
             triple: aarch64-unknown-linux-gnu
@@ -49,7 +49,7 @@ jobs:
         uses: actions/checkout@v3
         with:
           repository: succinctlabs/sp1
-          ref: n/1.82-build
+          ref: dev
           path: sp1
 
       - name: Build