fix: update minimum GitVersion.Tool to 6.2.0 so output is compatible

[MarcelGosselin]

Fixes #1824

Starting at version 4.2.0 of gittools/actions/gitversion, thanks to !1815, we no longer read the output of GitVersion.Tool from stdout but rather from a file on disk.

However, before version 6.2.0 of GitVersion.Tool, the output file was encoded as UTF-8 with a BOM. When parsing the content of the file, JSON.parse(content); fails with:

SyntaxError: Unexpected token '', "{
  "Ass"... is not valid JSON
    at JSON.parse (<anonymous>)

This PR modifies the minimum requirements for the GitVersion.Tool to the version which saves the output as UTF-8 (without BOM) which is 6.2.0. In that version, the !4443 changed all file access and as a side-effect changed the encoding of the output file.

I am not sure how I was supposed to handle the version numbers in docs/versions.md, I am open to comments

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[mergify]

Thank you @MarcelGosselin for your contribution!