chore: remove outdated dfx in jobs of face recognition example

Author: marc0olo

.github/workflows/rust-face-recognition-example.yaml

@@ -19,12 +19,11 @@ jobs:
     steps:
       - uses: actions/checkout@v1
       - name: Provision Darwin
-        run: DFX_VERSION="0.20.2-beta.0" bash .github/workflows/provision-darwin.sh
+        run: bash .github/workflows/provision-darwin.sh
       - name: Remove networks.json
         run: rm -f ~/.config/dfx/networks.json
       - name: Rust Face Recognition Darwin
         run: |
-          dfxvm install 0.22.0-beta.0
           dfx start --background
           pushd rust/face-recognition
           npm install
@@ -35,12 +34,11 @@ jobs:
     steps:
       - uses: actions/checkout@v1
       - name: Provision Linux
-        run: DFX_VERSION="0.20.2-beta.0" bash .github/workflows/provision-linux.sh
+        run: bash .github/workflows/provision-linux.sh
       - name: Remove networks.json
         run: rm -f ~/.config/dfx/networks.json
       - name: Rust Face Recognition Linux
         run: |
-          dfxvm install 0.22.0-beta.0
           dfx start --background
           pushd rust/face-recognition
           npm install

rust/face-recognition/dfx.json

@@ -26,7 +26,6 @@
       "type": "assets"
     }
   },
-  "dfx": "0.22.0-beta.0",
   "defaults": {
     "build": {
       "args": "",