Fixes version on patch template

What does this MR do and why?

While working on the last patch releases, I noticed the version on the Final steps was always referring to the minor one. Examples:

• gitlab-org/release/tasks#6485 (closed)
• gitlab-org/release/tasks#6484 (closed)

This commit fixes the version on the patch template to use the actual version the patch release is being prepared for.

Before

• Create the 16.6 version on version.gitlab.com.

After

• Create the 16.6.4 version on version.gitlab.com.

Author Check-list

• Has documentation been updated?