Update cargo-dinghy for iOS (0.4.62 -> 0.4.68)

Author: Bromeon

.github/workflows/full-ci.yml

@@ -34,6 +34,7 @@ env:
   # Note: using variables is limited at the moment, see https://github.com/actions/runner/issues/480
   GDRUST_FEATURES: "gdnative/async,gdnative/serde"
   CARGO_DENY_VERSION: "0.11.0"
+  CARGO_DINGHY_VERSION: "0.4.68"
 
 on:
   push:
@@ -194,10 +195,10 @@ jobs:
       - name: "Install cargo-dinghy"
         run: |
           rustup target add x86_64-apple-ios
-          curl -L https://github.com/sonos/dinghy/releases/download/0.4.62/cargo-dinghy-macos-0.4.62.tgz -o cargo-dinghy-macos.tar.gz
+          curl -L https://github.com/sonos/dinghy/releases/download/$CARGO_DINGHY_VERSION/cargo-dinghy-macos-$CARGO_DINGHY_VERSION.tgz -o cargo-dinghy-macos.tar.gz
           tar -zxvf cargo-dinghy-macos.tar.gz
           mkdir -p $HOME/.cargo/bin
-          cp cargo-dinghy-0.4.62/cargo-dinghy $HOME/.cargo/bin
+          cp cargo-dinghy-$CARGO_DINGHY_VERSION/cargo-dinghy $HOME/.cargo/bin
       - name: "Cross-compile to iOS"
         run: |
           RUNTIME_ID=$(xcrun simctl list runtimes | grep iOS | cut -d ' ' -f 7 | tail -1)