feat: improve document okteto version not latest

[BaeJi77]

What this PR does / why we need it:

If you currently use the latest version of okteto, you cannot run okteto normally.

So, I applied it to the document to download the most recent version among the 2.x.x versions.

$ curl https://get.okteto.com -sSfL | OKTETO_VERSION=2.31.0 sh
> Using Release Channel: stable
> Using Version: 2.31.0
> Downloading https://downloads.okteto.com/cli/stable/2.31.0/okteto-Darwin-arm64
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100 79.4M  100 79.4M    0     0  12.3M      0  0:00:06  0:00:06 --:--:-- 18.2M
> Installing /usr/local/bin/okteto
> Okteto successfully installed!

Which issue this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close that issue when PR gets merged): fixes #

Special notes for your reviewer:

Checklist:

• Fixes #
• PR messages has document related information
• Labelled this PR & related issue with breaking-changes tag
• PR messages has breaking changes related information
• Labelled this PR & related issue with requires-upgrade tag
• PR messages has upgrade related information
• Commit has unit tests
• Commit has integration tests
• E2E run Required for the changes

[namkyu1999]

can you check DCO?