Updating subscriptions fails on sequence update

**Describe the bug**
If a sequence is updated with a new retry configuration the sequence is not successfully updated.

**Expected behavior**
The sequence is updated successfully

**To Reproduce**
Knative Kafka Broker needs to be installed: https://github.com/knative-extensions/eventing-kafka-broker

Create sequence:
```yaml
apiVersion: serving.knative.dev/v1
kind: Service
metadata:
name: first
spec:
template:
spec:
containers:
- image: gcr.io/knative-releases/knative.dev/eventing/cmd/appender
env:
- name: MESSAGE
value: " - Handled by 0"

---
apiVersion: serving.knative.dev/v1
kind: Service
metadata:
name: second
spec:
template:
spec:
containers:
- image: gcr.io/knative-releases/knative.dev/eventing/cmd/appender
env:
- name: MESSAGE
value: " - Handled by 1"
---
apiVersion: serving.knative.dev/v1
kind: Service
metadata:
name: third
spec:
template:
spec:
containers:
- image: gcr.io/knative-releases/knative.dev/eventing/cmd/appender
env:
- name: MESSAGE
value: " - Handled by 2"
---
apiVersion: flows.knative.dev/v1
kind: Sequence
metadata:
name: sequence
spec:
channelTemplate:
apiVersion: messaging.knative.dev/v1beta1
kind: KafkaChannel
spec:
numPartitions: 1
replicationFactor: 3
steps:
- ref:
apiVersion: serving.knative.dev/v1
kind: Service
name: first
delivery:
backoffDelay: PT1S
backoffPolicy: linear
retry: 5
- ref:
apiVersion: serving.knative.dev/v1
kind: Service
name: second
delivery:
backoffDelay: PT1S
backoffPolicy: linear
retry: 5
- ref:
apiVersion: serving.knative.dev/v1
kind: Service
name: third
delivery:
backoffDelay: PT1S
backoffPolicy: linear
retry: 5
```
The subscriptions should have been created.

```yaml
$ kubectl get subscription
NAME AGE READY REASON
sequence-kn-sequence-0 14s True
sequence-kn-sequence-1 14s True
sequence-kn-sequence-2 14s True
```
Modify the sequence and update the delivery spec on step 2 -> retry: 7 or something

The sequence update fails and when displaying the sequence yaml, the following entry is displayed in the `conditions` block
```yaml
- lastTransitionTime: "2024-06-20T14:03:00Z"
message: 'failed to reconcile subscription resource for step: 0 : subscriptions.messaging.knative.dev
"sequence-kn-sequence-0" is invalid: metadata.resourceVersion: Invalid value:
0x0: must be specified for an update'
reason: SubscriptionsNotReady
status: Unknown
type: Ready
```

**Knative release version**
1.14.3

**Additional context**
This bug is a followup to #7939. We deployed the 1.14.3 release to a test system and attempted to update a sequence, which is why the reproduction steps are essentially the same as in that report.