remove GC proposal (#110)

Signed-off-by: Levai Ágbàrà <[email protected]>

Author: Mackenzie-OO7

docs/develop/wasmedge/extensions/proposals.md

@@ -56,10 +56,6 @@ WasmEdge implements the following [WASI proposals](https://github.com/WebAssembl
 | [Machine Learning (wasi-nn)][] | `x86_64 Linux`, OpenVINO (since `0.10.1`), PyTorch (since `0.11.1`), and TensorFlow-Lite (since `0.11.2`) backends |
 | [proxy-wasm][] | `x86_64 Linux (Interpreter only)` (since `0.8.2`) |
 
-The following proposals is under development and may be supported in the future:
-
-- WebAssembly GC Proposal
-
 [Sockets]: https://github.com/WebAssembly/wasi-sockets
 [Crypto]: https://github.com/WebAssembly/wasi-crypto
 [Machine Learning (wasi-nn)]: https://github.com/WebAssembly/wasi-nn