build(deps): update jni-sys requirement from 0.3 to 0.4

Updates the requirements on [jni-sys](https://github.com/jni-rs/jni-sys) to permit the latest version.
- [Release notes](https://github.com/jni-rs/jni-sys/releases)
- [Changelog](https://github.com/jni-rs/jni-sys/blob/master/CHANGELOG.md)
- [Commits](jni-rs/jni-sys@v0.3.0...v0.4.0)

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

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

Author: dependabot[bot]

android-activity/Cargo.toml

@@ -30,7 +30,7 @@ native-activity = []
 
 [dependencies]
 log = "0.4"
-jni-sys = "0.3"
+jni-sys = "0.4"
 cesu8 = "1"
 jni = "0.21"
 ndk-sys = "0.5.0-beta.0"