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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-143403`_

- refactor(be): share one helper for From-header parsing (#4203)
- chore(deps)(deps): Bump the "weekly-version-updates" group with 3 updates across multiple ecosystems (#4186)

[Full release notes](https://github.com/dfinity/internet-identity/releases/tag/release-2026-08-11)

## 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 db8200dc4932df99c23a41232547f11a551164c3
./scripts/verify-hash \
    --ii-hash 897d2f2a125059aabf2eb0c4bb875b19a8873b71c4dbc8c0d13c174e5c1708b9 \
    --archive-hash d322bb6f05d1d0ba9e4b206846c9e61efc4d7d5cd578b2fee99006255572abfb
```

## 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 db8200dc4