Enable features system-proxy and charset of reqwest by default (#2474)

Should be enabled so that the proxy settings on windows and macos are
honored

---------

Signed-off-by: Jiahao XU <30436523+NobodyXu@users.noreply.github.com>

Author: NobodyXu

crates/binstalk-downloader/Cargo.toml

@@ -36,6 +36,8 @@ rc-zip-sync = { version = "4.3.5", features = [
 ] }
 reqwest = { version = "0.13.1", features = [
     "http2",
+    "charset",
+    "system-proxy",
     "stream",
     "zstd",
     "gzip",