Remove reth arm64 build (running out of memory) (#338)

Author: mdehoog

.github/workflows/pr.yml

@@ -31,8 +31,6 @@ jobs:
         include:
           - arch: linux/amd64
             features: jemalloc,asm-keccak,optimism
-          - arch: linux/arm64
-            features: jemalloc,optimism
     steps:
       - name: Checkout
         uses: actions/checkout@v3