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Install, reinstall or upgrade code of a canister controlled by the NNS.

# Backend Canister Upgrade

## What's Changed
_Since `proposal-backend-143472`_

* fix(be): pin AuthorizationKey on email challenges and drop pending on… (#4195)
* fix(fe,be): three papercuts found triaging intermittent OpenID sign-ins (#4213)
* fix(be,fe): base the Settings MCP config on the certified identity_info (#4215)
* test(be): regression coverage for DKIM From-header forgery in email recovery (#4209)
* fix(be): reject email addresses containing more than one @ (#4208)

[Full release notes](https://github.com/dfinity/internet-identity/releases/tag/release-2026-08-14)

## Wasm Verification

To build the wasm modules yourself and verify their hashes, run the following commands from the root of the [Internet Identity repository](https://github.com/dfinity/internet-identity):

```
git pull  # to ensure you have the latest changes.
git checkout 21ab317d3bf27467336c902702bfd41b0f4ea06e
./scripts/verify-hash --ii-hash fd51df0366bff3e3dae13eadc3baa5f228397dfc49a7ee3b1e7c6683908625ea
```

## Backend Argument Verification

Run the following command to verify the backend upgrade argument hash:

```
didc encode -d ./src/internet_identity/internet_identity.did -t '(opt InternetIdentityInit)' '(null)' | xxd -r -p | sha256sum
```

The output should match the argument hash.


Upgrade Internet Identity Backend Canister to 21ab317d3