Update franz-go to v1.21.3 (#52408)

This PR contains the following updates:

| Package | Change | [Age](https://docs.renovatebot.com/merge-confidence/) | [Adoption](https://docs.renovatebot.com/merge-confidence/) | [Passing](https://docs.renovatebot.com/merge-confidence/) | [Confidence](https://docs.renovatebot.com/merge-confidence/) |
|---|---|---|---|---|---|
| [github.com/twmb/franz-go](https://redirect.github.com/twmb/franz-go) | `v1.21.2` → `v1.21.3` | ![age](https://developer.mend.io/api/mc/badges/age/go/github.com%2ftwmb%2ffranz-go/v1.21.3?slim=true) | ![adoption](https://developer.mend.io/api/mc/badges/adoption/go/github.com%2ftwmb%2ffranz-go/v1.21.3?slim=true) | ![passing](https://developer.mend.io/api/mc/badges/compatibility/go/github.com%2ftwmb%2ffranz-go/v1.21.2/v1.21.3?slim=true) | ![confidence](https://developer.mend.io/api/mc/badges/confidence/go/github.com%2ftwmb%2ffranz-go/v1.21.2/v1.21.3?slim=true) |

---

> [!WARNING]
> Some dependencies could not be looked up. Check the [Dependency Dashboard](../issues/33469) for more information.

---

### Release Notes

<details>
<summary>twmb/franz-go (github.com/twmb/franz-go)</summary>

### [`v1.21.3`](https://redirect.github.com/twmb/franz-go/blob/HEAD/CHANGELOG.md#v1213)

[Compare Source](https://redirect.github.com/twmb/franz-go/compare/v1.21.2...v1.21.3)

\===

This patch release contains a few bug fixes and a few internal improvements.

- `PollRecords` / `PollFetches` could permanently hang since v1.21.0 if a
  consumer session stopped (usually via metadata updates) while
  fetches to more than four brokers were pending and no poll was in
  flight. This could only affect users that deliberately set `MaxConcurrentFetches(0)`,
  or that were using `ShareMaxRecordsStrict`.

- Producing to a topic whose partitions ALL have a retriable load error
  (e.g. a rolling restart of an RF=1 broker briefly leaving every
  partition leaderless) no longer fails records up front with "unable to
  partition record due to no usable partitions". Instead, the records
  remain buffered and retried as metadata reloads.

- Classic consumer groups now rejoin immediately when an offset commit
  returns `UNKNOWN_MEMBER_ID` or `ILLEGAL_GENERATION` (the broker lost
  the member, e.g. a session expired during a network blip), rather than
  consuming as a zombie until the heartbeat loop notices the dead session.

- `DescribeShareGroupOffsets`, `AlterShareGroupOffsets`, and
  `DeleteShareGroupOffsets` are now routed to the group coordinator
  rather than the share coordinator (which would reject the requests
  for being misrouted).

- The client-internal metadata cache now deeply clones the cached response
  before putting it into the cache and before returning it via
  `RequestCachedMetadata` (which is now used by default in kadm), eliminating
  data race possibilities.

- Various next-gen rebalancer session improvements.

#### Relevant commits

- [`f8842170`](https://redirect.github.com/twmb/franz-go/commit/f8842170) **improvement** kgo: fall back to all partitions when no partition is writable (thanks [@&#8203;ericsg666](https://redirect.github.com/ericsg666)!)
- [`824e34d2`](https://redirect.github.com/twmb/franz-go/commit/824e34d2) **improvement** kgo: rejoin a classic group when a commit returns a fatal member error (thanks [@&#8203;v14dis14v](https://redirect.github.com/v14dis14v)!)
- [`f520e820`](https://redirect.github.com/twmb/franz-go/commit/f520e820) **bugfix** kgo: do not exit manageFetchConcurrency while sources are pending in wantFetch (thanks [@&#8203;SLoeuillet](https://redirect.github.com/SLoeuillet)!)
- [`8d9c836b`](https://redirect.github.com/twmb/franz-go/commit/8d9c836b) **bugfix** kgo: isolate metadata cache from broker response
- [`19f7dbb2`](https://redirect.github.com/twmb/franz-go/commit/19f7dbb2) **bugfix** kgo,kfake: route share group offset RPCs to the group coordinator

</details>

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Co-authored-by: dd-octo-sts[bot] <200755185+dd-octo-sts[bot]@users.noreply.github.com>
Co-authored-by: devflow.devflow-routing-intake <devflow.devflow-routing-intake@kubernetes.us1.ddbuild.io>

Author: 3 people

go.mod

@@ -318,7 +318,7 @@ require (
 	github.com/syndtr/gocapability v0.0.0-20200815063812-42c35b437635
 	github.com/tinylib/msgp v1.6.4
 	github.com/tklauser/go-sysconf v0.3.16 // indirect
-	github.com/twmb/franz-go v1.21.2
+	github.com/twmb/franz-go v1.21.3
 	github.com/twmb/franz-go/pkg/kadm v1.18.0
 	github.com/twmb/franz-go/pkg/kmsg v1.13.1
 	github.com/twmb/murmur3 v1.1.8