Siwtch to libachive v3.6.1

.github/workflows/build-wheels.yaml

@@ -6,6 +6,9 @@ on:
       - master
       - extended
 
+env:
+  libarchive_tag: v3.6.1
+
 jobs:
   many_linux_wheels:
     name: manylinux-wheels
@@ -42,7 +45,7 @@ jobs:
     - name: Build libarchive C sources
       run: |
         git clone https://github.com/libarchive/libarchive.git libarchive-src    
-        cd libarchive-src; git checkout 3.5
+        cd libarchive-src; git checkout {{ env.libarchive_tag }}
         mkdir build-libarchive; cd build-libarchive
         cmake ../
         make -j$(nproc);  make install