Upgrade plexi-core to 0.1.1

Summary:
Release [0.1.1](cloudflare/plexi#11) incorporates cloudflare/plexi#9 so we don't need to maintain any patches for bincode/

After modifying the release version, run:
```
fbcode/common/rust/tools/reindeer/vendor
```

Reviewed By: zertosh

Differential Revision: D67636906

fbshipit-source-id: f627dd1ef0ba1085f179d61046062189f0dc81ec

Cargo.toml

@@ -11,7 +11,6 @@ imgui-sys = { git = "https://github.com/imgui-rs/imgui-rs.git", rev = "2abba18c0
 lru-disk-cache = { git = "https://github.com/mozilla/sccache", rev = "fdbf843d174c6796d736b2b61dab0297670390f8" }
 perf-event = { version = "0.4", git = "https://github.com/krallin/perf-event.git", rev = "86224a9bc025d5d19f719542f27c8c629a08b167" }
 perf-event-open-sys = { version = "4.0", git = "https://github.com/krallin/perf-event.git", rev = "86224a9bc025d5d19f719542f27c8c629a08b167" }
-plexi-core = { git = "https://github.com/haochenuw/plexi", rev = "a0326d9802a594ca5382b075620135607e1cdb23" }
 pyo3-build-config = { package = "pyo3-build-config", version = "0.21.2", git = "https://github.com/fbsource/pyo3", rev = "ff94a09031cc29d88d57ae3c846e5b871497aeb9" }
 quickcheck = { git = "https://github.com/jakoschiko/quickcheck", rev = "6ecdf5bb4b0132ce66670b4d46453aa022ea892c" }
 tokio-vsock = { git = "https://github.com/cryo28/tokio-vsock", rev = "9bc4bf2c933e1bc3234bf6e2709bcec6696221a9" }