Upgrade jni to 0.21.1

[delan]

Split from #31278.

Co-authored-by: Martin Robinson [email protected]
Co-authored-by: Mukilan Thiyagarajan [email protected]

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• ./mach build -d does not report any errors
• ./mach test-tidy does not report any errors
• These changes do not require tests because they do not change functionality.

[mrobinson]

Here's my attempt as fixing these issues: 41bde52

I'm stuck fighting with the borrow checker. It's unclear how to create a JValue from a Rust string and pass it to JNIEnv::call_method without requiring a double mutable borrow of JNIEnv.

[mukilan]

With these changes on top of @mrobinson 's commit, I was able to get the android build to succeed and do a test run on my device.

The major change is the addition of the <'local> lifetime parameter to the JNI methods and methods that take both &mut JNIEnv and a some subtype of &JObject. I only needed to add them to the methods that actually used both arguments, but I've added them to all JNI methods, even though only the env parameter was used and the rest were ignored.

[mrobinson]

@mukilan Would you mind pushing your changes to @delan's branch so we can land them?

[mukilan]

@mrobinson I've rebased and pushed all the changes in a single commit. Please review whenever you get a chance.

[mrobinson]

Nice!