bump yew 0.22

[Infinoid]

bump: yew v0.22

[Infinoid]

This is a step towards patternfly-yew/patternfly-yew#161.

There is one build warning:

   Compiling popper-rs v0.3.2 (/home/infinoid/bounce/popper-rs)
warning: unused import: `self::yew::*`
 --> src/state/mod.rs:7:9
  |
7 | pub use self::yew::*;
  |         ^^^^^^^^^^^^
  |
  = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default

warning: `popper-rs` (lib test) generated 1 warning (1 duplicate)
warning: `popper-rs` (lib) generated 1 warning (run `cargo fix --lib -p popper-rs` to apply 1 suggestion)

This warning pre-dates my changes, so I left it alone.

Testing:

• cargo check --features=debug,yew passes
• cargo test --features=debug,yew says there are no unit tests
• cd examples/yew; trunk serve shows me a page with some buttons; mouseovers/clicks do things.