Use .txz archive for dependencies

CI/install_conan_dependencies.sh

@@ -2,8 +2,8 @@
 
 RELEASE_TAG="1.2"
 FILENAME="$1"
-DOWNLOAD_URL="https://github.com/vcmi/vcmi-dependencies/releases/download/$RELEASE_TAG/$FILENAME.tgz"
+DOWNLOAD_URL="https://github.com/vcmi/vcmi-dependencies/releases/download/$RELEASE_TAG/$FILENAME.txz"
 
 mkdir ~/.conan
 cd ~/.conan
-curl -L "$DOWNLOAD_URL" | tar -xzf -
+curl -L "$DOWNLOAD_URL" | tar -xf - --xz