Bump com.microsoft.onnxruntime:onnxruntime-android from 1.20.0 to 1.21.0 (#435)

Bumps [com.microsoft.onnxruntime:onnxruntime-android](https://github.com/microsoft/onnxruntime) from 1.20.0 to 1.21.0.
- [Release notes](https://github.com/microsoft/onnxruntime/releases)
- [Changelog](https://github.com/microsoft/onnxruntime/blob/main/docs/ReleaseManagement.md)
- [Commits](microsoft/onnxruntime@v1.20.0...v1.21.0)

---
updated-dependencies:
- dependency-name: com.microsoft.onnxruntime:onnxruntime-android
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Author: dependabot[bot]

gradle/libs.versions.toml

@@ -31,7 +31,7 @@ mockk = "1.13.17"
 mockito = "2.2.0"
 coreKtx = "1.15.0"
 crypto = "1.0.0"
-onnx = "1.20.0"
+onnx = "1.21.0"
 workManager = "2.10.0"
 room = "2.6.1"
 timber = "5.0.1"