Fix hard-coded version (#5902)

* fix hard-coded version of serving-core.yaml's url to env artifact

* change --8<-- to {% include %} for calling define_env

docs/install/operator/knative-with-operators.md

@@ -10,7 +10,7 @@ The following table describes the supported versions of Serving and Eventing for
 | v1.13    | v1.13.0<br/>v1.12.0, v1.12.1, v1.12.2 and v1.12.3<br/>v1.11.0, v1.1.1, v1.11.2, v1.11.3, v1.11.6, v1.11.5 and v1.11.6<br/>v1.10.0, v1.10.1 and v1.10.2 | v1.13.0<br/>v1.12.0, v1.12.1, v1.12.2 and v1.12.3<br/>v1.11.0, v1.11.1, v1.11.2, v1.11.3, v1.11.4, v1.11.5 and v1.11.6<br/>v1.10.0, v1.10.1, v1.10.2, v1.10.3, v1.10.4, v1.10.5 and v1.10.6 |
 
 --8<-- "prerequisites.md"
---8<-- "security-prereqs-images.md"
+{% include "security-prereqs-images.md" %}
 
 ## Install the Knative Operator
 

docs/install/yaml-install/eventing/install-eventing-with-yaml.md

@@ -3,7 +3,7 @@
 This topic describes how to install Knative Eventing by applying YAML files using the `kubectl` CLI.
 
 --8<-- "prerequisites.md"
---8<-- "security-prereqs-images.md"
+{% include "security-prereqs-images.md" %}
 
 ## Install Knative Eventing
 

docs/install/yaml-install/serving/install-serving-with-yaml.md

@@ -3,7 +3,7 @@
 This topic describes how to install Knative Serving by applying YAML files using the `kubectl` CLI.
 
 --8<-- "prerequisites.md"
---8<-- "security-prereqs-images.md"
+{% include "security-prereqs-images.md" %}
 
 ## Install the Knative Serving component
 

docs/snippets/security-prereqs-images.md

@@ -6,8 +6,8 @@ Knative releases from 1.9 onwards are signed with [cosign](https://docs.sigstore
 
 1. Extract the images from a manifeset and verify the signatures.
 
-```
-curl -sSL https://github.com/knative/serving/releases/download/knative-v1.10.1/serving-core.yaml \
+```bash
+curl -sSL {{ artifact(repo="serving",file="serving-core.yaml") }} \
   | grep 'gcr.io/' | awk '{print $2}' | sort | uniq \
   | xargs -n 1 \
     cosign verify -o text \