Fix compilation with 1.70.0 cargo

Cargo bug: https://github.com/rust-lang/cargo/issues/10788

Caused meli to not be able to be installed with 1.70.0 cargo.

This commit expresses the static dependencies differently to allow both
1.70.0 and later versions understand the optional dependency feature
activation.

Signed-off-by: Manos Pitsidianakis <manos@pitsidianak.is>

meli/Cargo.toml

@@ -85,8 +85,8 @@ gpgme = ["melib/gpgme"]
 tls-static = ["melib/tls-static"]
 http-static = ["melib/http-static"]
 sqlite3-static = ["melib/sqlite3-static"]
-dbus-static = ["dep:notify-rust", "notify-rust/d_vendored"]
-libz-static = ["dep:libz-sys", "libz-sys/static"]
+dbus-static = ["dep:notify-rust", "notify-rust?/d_vendored"]
+libz-static = ["dep:libz-sys", "libz-sys?/static"]
 static = ["tls-static", "http-static", "sqlite3-static", "dbus-static", "libz-static"]
 
 # Print tracing logs as meli runs in stderr