Update awalsh128/cache-apt-pkgs-action

Turns out the "latest" tag for this action hasn't been updated in quite
a while despite seeing several releases since then.

Author: bjorn3

.github/workflows/checks.yaml

@@ -116,7 +116,7 @@ jobs:
             target: "i686-unknown-linux-gnu"
             gcc: "i686-linux-gnu-gcc"
     steps:
-      - uses: awalsh128/cache-apt-pkgs-action@latest
+      - uses: awalsh128/cache-apt-pkgs-action@v1.4.3
         with:
           packages: qemu-user qemu-user-static qemu-system-s390x gcc-s390x-linux-gnu gcc-i686-linux-gnu g++-s390x-linux-gnu
           version: 1.0