chore(docs): fix broken upgrade guide link in banner

[dreamorosi]

Description of your changes

This PR fixes the broken relative link to the v2 upgrade guide in the docs (see image below for reference).

Before merging the PR with the banner I tested it locally and verified that the link was working fine, however while working on this PR I verified again and realized that it's not possible to test this type of url locally because when running the docs locally we are missing the /<version> path from the url.

In most of the doc links this is not a problem, however for links interpolated in the overrides this seems to be an issue.

I couldn't find the proper way of doing it according to MKDocs Material conventions so I opted for hardcoding the /latest path; mainly because this is a temporary one-off link.

Related issues, RFCs

Issue number: #2090

Checklist

• My changes meet the tenets criteria
• I have performed a self-review of my own code
• I have commented my code where necessary, particularly in areas that should be flagged with a TODO, or hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my change is effective and works
• The PR title follows the conventional commit semantics

Breaking change checklist

Is it a breaking change?: NO

• I have documented the migration process
• I have added, implemented necessary warnings (if it can live side by side)

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues

Measures
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

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