Update jni requirement from 0.20.0 to 0.21.1

Updates the requirements on [jni](https://github.com/jni-rs/jni-rs) to permit the latest version.
- [Release notes](https://github.com/jni-rs/jni-rs/releases)
- [Changelog](https://github.com/jni-rs/jni-rs/blob/master/CHANGELOG.md)
- [Commits](jni-rs/jni-rs@v0.20.0...v0.21.1)

---
updated-dependencies:
- dependency-name: jni
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Cargo.toml

@@ -7,7 +7,7 @@ license = "MIT"
 description = "Android intent utilities"
 
 [dependencies]
-jni = "0.20.0"
+jni = "0.21.1"
 ndk-context = "0.1.1"
 
 [workspace]

example/Cargo.toml

@@ -9,7 +9,7 @@ crate-type = ["cdylib"]
 [dependencies]
 android-activity = { version = "0.4.0", features = ["native-activity"] }
 android-intent.path = "../"
-jni = "0.20.0"
+jni = "0.21.1"
 ndk-context = "0.1.1"
 
 [package.metadata.android.sdk]