rust build is unstable

https://gitlab.freedesktop.org/ystreet/gst-plugins-base/-/jobs/1824404

 error[E0433]: failed to resolve: could not find `__rt` in `quote`
   --> /cache/gstreamer/cargo/registry/src/github.com-1ecc6299db9ec823/failure_derive-0.1.6/src/lib.rs:107:70
    |
107 | fn display_body(s: &synstructure::Structure) -> Result, Error> {
    |                                                                      ^^^^ could not find `__rt` in `quote`
error: aborting due to previous error
For more information about this error, try `rustc --explain E0433`.
error: could not compile `failure_derive`.
warning: build failed, waiting for other jobs to finish...
error: build failed

https://gitlab.freedesktop.org/psreport/gst-plugins-base/-/jobs/1802029

    Updating crates.io index
error: failed to fetch `https://github.com/rust-lang/crates.io-index`
Caused by:
  object not found - no match for id (f15be86f401bae4970bffec1955b5b2a8a5ff42c); class=Odb (9); code=NotFound (-3)