Update wit-bindgen used in testing (#2508)

Enables updating Wasmtime and still passing wit-dylib tests

Author: alexcrichton

.github/actions/install-rust/action.yml

@@ -70,4 +70,4 @@ runs:
     - name: Setup `wasmtime`
       uses: bytecodealliance/actions/wasmtime/setup@v1
       with:
-        version: "v40.0.0"
+        version: "v44.0.0"