chore(deps): update alpine docker tag to v3.22 (#15616)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| alpine | final | minor | `3.21` -> `3.22` |

---

### Configuration

📅 **Schedule**: Branch creation - "before 5am on the first day of the
month" (UTC), 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.

---

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

---

This PR was generated by [Mend Renovate](https://mend.io/renovate/).
View the [repository job
log](https://developer.mend.io/github/rust-lang/cargo).

<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiI0MC4zMy42IiwidXBkYXRlZEluVmVyIjoiNDAuMzMuNiIsInRhcmdldEJyYW5jaCI6Im1hc3RlciIsImxhYmVscyI6W119-->

Author: weihanglo

crates/cargo-test-support/containers/sshd/Dockerfile

@@ -1,4 +1,4 @@
-FROM alpine:3.21
+FROM alpine:3.22
 
 RUN apk add --no-cache openssh git
 RUN ssh-keygen -A