fix(bff): bump golang base image in Dockerfile

[Al-Pragliola]

Description

Fixing error in https://github.com/kubeflow/model-registry/actions/runs/13016794276/job/36307908025

How Has This Been Tested?

run docker build locally

Merge criteria:

• All the commits have been signed-off (To pass the DCO check)

• The commits have meaningful messages; the author will squash them after approval or in case of manual merges will ask to merge with squash.
• Testing instructions have been added in the PR body (for PRs involving changes that are not immediately obvious).
• The developer has manually tested the changes and verified that the changes work.
• Code changes follow the kubeflow contribution guidelines.

[google-oss-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ederign

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[ederign]

@Al-Pragliola, thank you so much for fixing this issue that I've introduced.

[ederign]

/lgtm