Update Nautobot release checklist to reflect new process

[gsnider2195]

Closes: #DNE

What's Changed

Reflects new release process:

gitGraph
    commit
    commit
    branch develop
    checkout develop
    commit
    commit
    branch release/1.2.3
    checkout release/1.2.3
    commit
    checkout main
    merge release/1.2.3
    commit tag: "v1.2.3"
    branch main-to-develop-post-1.2.3
    commit
    checkout develop
    merge main-to-develop-post-1.2.3
    commit
    commit

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TODO

• Explanation of Change(s)
• Added change log fragment(s) (for more information see the documentation)
• Attached Screenshots, Payload Example
• Unit, Integration Tests
• Documentation Updates (when adding/changing features)
• Example Plugin Updates (when adding/changing features)
• Outline Remaining Work, Constraints from Design

[glennmatthews]

Good stuff. Appreciate the housekeeping!