chore(deps-dev): bump @dfinity/agent from 0.10.2 to 0.10.3

Bumps [@dfinity/agent](https://sdk.dfinity.org/docs/index.html) from 0.10.2 to 0.10.3.

---
updated-dependencies:
- dependency-name: "@dfinity/agent"
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

package.json

@@ -44,7 +44,7 @@
     "react-dom": ">=16.8.1"
   },
   "devDependencies": {
-    "@dfinity/agent": "0.10.2",
+    "@dfinity/agent": "0.10.3",
     "@dfinity/auth-client": "0.10.2",
     "@dfinity/authentication": "0.10.2",
     "@dfinity/candid": "0.10.3",