libarchive: Update script to get 3.8.1

Utilities/Scripts/update-libarchive.bash

@@ -8,7 +8,7 @@ readonly name="LibArchive"
 readonly ownership="LibArchive Upstream <[email protected]>"
 readonly subtree="Utilities/cmlibarchive"
 readonly repo="https://github.com/libarchive/libarchive.git"
-readonly tag="v3.7.9"
+readonly tag="v3.8.1"
 readonly shortlog=false
 readonly paths="
   CMakeLists.txt