Bump lambda_runtime in /s3-uploader/runtimes/rust_on_provided_al2

Bumps [lambda_runtime](https://github.com/aws/aws-lambda-rust-runtime) from 1.0.2 to 1.2.1.
- [Release notes](https://github.com/aws/aws-lambda-rust-runtime/releases)
- [Changelog](https://github.com/aws/aws-lambda-rust-runtime/blob/main/release-plz.toml)
- [Commits](aws/aws-lambda-rust-runtime@v1.0.2...lambda_runtime-v1.2.1)

---
updated-dependencies:
- dependency-name: lambda_runtime
  dependency-version: 1.2.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

s3-uploader/runtimes/rust_on_provided_al2/Cargo.lock

@@ -4,7 +4,7 @@ version = "1.0.0"
 edition = "2024"
 
 [dependencies]
-lambda_runtime = "1.0.2"
+lambda_runtime = "1.2.1"
 tokio = { version = "1", features = ["macros"] }
 serde_json = "1.0.149"