Remove workaround not needed on Ubuntu 22.04

Signed-off-by: Joe Richey <joerichey@google.com>

Author: josephlr

.github/workflows/tests.yml

@@ -75,11 +75,7 @@ jobs:
         with:
           targets: ${{ matrix.target }}
       - name: Install multilib
-        # update is needed to fix the 404 error on install, see:
-        # https://github.com/actions/virtual-environments/issues/675
-        run: |
-          sudo apt-get update
-          sudo apt-get install gcc-multilib
+        run: sudo apt-get install gcc-multilib
       - uses: Swatinem/rust-cache@v2
       - run: cargo test --target=${{ matrix.target }} --features=std