Dockerfile: dev-container: update buildx v0.20.1

[thaJeztah]

Also align versions in the Dockerfile.dev Dockerfile

full diff: docker/buildx@v0.20.0...v0.20.1

- Description for the changelog

- A picture of a cute animal (not mandatory but encouraged)

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 59.29%. Comparing base (7a72f38) to head (1acf32c).
Report is 8 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5815      +/-   ##
==========================================
+ Coverage   59.26%   59.29%   +0.02%     
==========================================
  Files         353      353              
  Lines       29540    29540              
==========================================
+ Hits        17508    17516       +8     
+ Misses      11052    11043       -9     
- Partials      980      981       +1     

[thaJeztah]

Adding comments, both to reduce merge conflicts when updating other versions, but also using standard formatting, so that they also show in --call outline output;

docker build --call outline .
...
TARGET: binary

BUILD ARG               VALUE    DESCRIPTION
BASE_VARIANT            alpine
ALPINE_VERSION          3.21
GO_VERSION              1.23.6
XX_VERSION              1.6.1
GOVERSIONINFO_VERSION   v1.4.1
GO_LINKMODE             static   defines if static or dynamic binary should be produced
GO_BUILDTAGS                     defines additional build tags
GO_STRIP                         strips debugging symbols if set
CGO_ENABLED                      manually sets if cgo is used
VERSION                          sets the version for the produced binary
PACKAGER_NAME                    sets the company that produced the windows binary