Update rsa requirement from 0.6.1 to 0.9.6 in /sdk

Updates the requirements on [rsa](https://github.com/RustCrypto/RSA) to permit the latest version.
- [Changelog](https://github.com/RustCrypto/RSA/blob/master/CHANGELOG.md)
- [Commits](RustCrypto/RSA@v0.7.0-pre...v0.9.6)

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

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

sdk/Cargo.toml

@@ -145,7 +145,7 @@ getrandom = { version = "0.2.7", features = ["js"] }
 # to handle certificate timestamp checking correctly.
 instant = { version = "0.1.12", features = ["wasm-bindgen", "inaccurate"] }
 js-sys = "0.3.58"
-rsa = "0.6.1"
+rsa = "0.9.6"
 serde-wasm-bindgen = "0.5.0"
 spki = "0.6.0"
 wasm-bindgen = "0.2.83"