Fix hard-coded version

[Kai-Z-JP]

"Fixes #issue-number" or "Add description of the problem this PR solves"

Proposed Changes

• fixing hard-coded old version in security-prereqs-images.md
• change --8<-- to {% include %} for calling define_env

[linux-foundation-easycla]

• ✅login: Kai-Z-JP / (7e3c1cd)
• ✅login: Kai-Z-JP / (7e3c1cd, 8844df1)

The committers listed above are authorized under a signed CLA.

[knative-prow]

Welcome @Kai-Z-JP! It looks like this is your first PR to knative/docs 🎉

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[ReToCode]

/lgtm
/approve

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Kai-Z-JP, ReToCode

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[ReToCode]

Thanks!

/cherry-pick release-1.13

[knative-prow-robot]

@ReToCode: once the present PR merges, I will cherry-pick it on top of release-1.13 in a new PR and assign it to you.

In response to this:

Thanks!

/cherry-pick release-1.13

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[knative-prow-robot]

@ReToCode: new pull request created: #5903

In response to this:

Thanks!

/cherry-pick release-1.13

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.