CI: Bump setup-ohos-sdk to 0.2.3 (servo#38741)

Includes a fix, which deletes the SDK for ohos-native hosts, saving some
disk and cache space, since we only need the version for linux hosts.

Testing: [mach try
ohos](https://github.com/jschwe/servo/actions/runs/17024914816)

Signed-off-by: Jonathan Schwender <[email protected]>

Author: jschwe

.github/workflows/ohos.yml

@@ -67,7 +67,7 @@ jobs:
         run: sudo apt update && ./mach bootstrap --skip-lints
       - name: Setup OpenHarmony SDK
         id: setup_sdk
-        uses: openharmony-rs/[email protected].1
+        uses: openharmony-rs/[email protected].3
         with:
           version: "5.0.2"
           fixup-path: true