Update Rust crate rsa to 0.9.6 (#27479)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [rsa](https://togithub.com/RustCrypto/RSA) | workspace.dependencies | patch | `0.9.3` -> `0.9.6` |

---

### Configuration

📅 **Schedule**: Branch creation - "on the first day of the month" in timezone America/Los_Angeles, Automerge - At any time (no schedule defined).

🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied.

♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 **Ignore**: Close this PR and you won't be reminded about this update again.

---

 - [ ] If you want to rebase/retry this PR, check this box

---

This PR has been generated by [Mend Renovate](https://www.mend.io/free-developer-tools/renovate/). View repository job log [here](https://developer.mend.io/github/get-convex/convex).

GitOrigin-RevId: 6b3322f650a5b2969ccb6dd9de912bcdd41a2470

Cargo.toml

@@ -102,7 +102,7 @@ regex = "1"
 reqwest = { version = "0.11.24", features = [ "json", "stream", "gzip" ] }
 reqwest-middleware = "0.2.0"
 ring = "0.17.8"
-rsa = "0.9.3"
+rsa = "0.9.6"
 rusqlite = { version = "0.30", features = [ "bundled" ] }
 saffron = { git = "https://github.com/get-convex/saffron", rev = "1d842379919fb5c1988ac127cebd6167b1eb9bec", features = [ "std" ] }
 schemars = { version = "0.8" }