Fix tensorflow docker image tag for siammask

[saurabheights]

Motivation and context

Updates old docker image tag which are no longer available as discussed in
#4912

How has this been tested?

Deployed siammask using the new image.

Checklist

• I submit my changes into the develop branch
• [] I have added a description of my changes into CHANGELOG file
• [] I have updated the documentation accordingly
• [] I have added tests to cover my changes
• I have linked related issues (read github docs)
• [] I have increased versions of npm packages if it is necessary (cvat-canvas,
  cvat-core, cvat-data and cvat-ui)

License

• I submit my code changes under the same MIT License that covers the project.
  Feel free to contact the maintainers if that's a concern.

[nmanovic]

@saurabheights , thanks for the contribution!