[TASK] Replace DeepL Mock Api Server container image

[sbuerk]

Note that https://github.com/DeepLcom/deepl-mock needs to create a release for the latest tag
See: DeepLcom/deepl-mock#5

• [TASK] Switch deeplmockapi server image to ghcr.io/web-vision/wv-deeplmockapi-server
  The used container image for the DeepL Mock API Server has
  been outdated. Instead of creating manual build again this
  has now been properly solved by creating a public repository
  for the container image build along with automatic update
  rebuild and tagging. [1][2]

  This change now uses the new image instead of the stalled one.

  [1] https://github.com/web-vision/wv-deeplmockapi-server
  [2] https://github.com/web-vision/wv-deeplmockapi-server/pkgs/container/wv-deeplmockapi-server

• [TASK] Remove upper version constraint for deeplcom/deepl-php
  Due to the outdated DeepL Mock Api Server version testing
  the extension with a newer deeplcom/deepl-php client badly
  failed and has been mitigated by adding a composer version
  constraint to avoid breaking dependency versions.

  The container image for the DeepL Mock Api Server has been
  exchanged with a up-to-date once which rebuilds and releases
  itself automatically.

  Used command(s):

  composer require --no-update \
    "deeplcom/deepl-php":"^1.6.0"