Pin foundry version in CI (#1901)

### Description

Pin the foundry version in CI to the nightly from a few days ago.

Unfortunately the only releases are nightly.

### Drive-by changes

None

.github/workflows/node.yml

@@ -134,7 +134,7 @@ jobs:
       - name: Install Foundry
         uses: onbjerg/foundry-toolchain@v1
         with:
-          version: nightly
+          version: nightly-28b2ae6d5ad3e802b813b679e26bc15b9b8d230b
 
       - name: Install dependencies
         run: cd solidity && forge install
@@ -163,7 +163,6 @@ jobs:
       - name: forge-test
         run: yarn workspace @hyperlane-xyz/core run test:forge
 
-
       # Will fail if hardhat tests fail but not if forge tests fail
       - name: coverage
         run: |