Add --offline to zsh common comp

Author: A4-Tacks

src/etc/_cargo

@@ -12,6 +12,7 @@ _cargo() {
         '(-q --quiet)*'{-v,--verbose}'[use verbose output]'
         '(-q --quiet -v --verbose)'{-q,--quiet}'[no output printed to stdout]'
         '-Z+[pass unstable (nightly-only) flags to cargo]: :_cargo_unstable_flags'
+        '--offline[run without accessing the network]'
         '--frozen[require that Cargo.lock and cache are up-to-date]'
         '--locked[require that Cargo.lock is up-to-date]'
         '--color=[specify colorization option]:coloring:(auto always never)'
@@ -75,7 +76,6 @@ _cargo() {
                         {-F+,--features=}'[specify features to activate]:feature' \
                         "--default-features[enable the default features]" \
                         "--no-default-features[don't enable the default features]" \
-                        "--offline[run without accessing the network]" \
                         "--optional[mark the dependency as optional]" \
                         "--no-optional[mark the dependency as required]" \
                         "--dev[add as a dev dependency]" \