feat(Dockerfile.deps): switch to python:alpine base image

[Gearheads]

What this PR does / why we need it:
This change will avoid using the Microsoft Azure CLI Docker image, because the newer versions contain Azure Linux operating system instead of Alpine. This change in operating system can cause issues for users building on top of this image. Therefore introducing a breaking change, which I think we should try to avoid.

I used this GitHub issue for reference: Azure/azure-cli#19591

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes # The new mcr.microsoft.com/azure-cli:2.67.0 Docker image has migrated to using Azure Linx instead of Alpine for the underlying operating system: https://learn.microsoft.com/en-us/cli/azure/run-azure-cli-docker?view=azure-cli-latest

This causes the current Dockerfile.deps to fail during the goreleaser GitHub Action:

> [stage-1  2/10] RUN apk --no-cache add ca-certificates:
0.146 /bin/sh: line 1: apk: command not found
------
Dockerfile:41
--------------------
  39 |     # Azure CLI
  40 |     FROM mcr.microsoft.com/azure-cli:2.67.0
  41 | >>> RUN apk --no-cache add ca-certificates
  42 |     
  43 |     WORKDIR /app/
--------------------
ERROR: failed to solve: process "/bin/sh -c apk --no-cache add ca-certificates" did not complete successfully: exit code: 127

https://github.com/fidelity/kconnect/actions/runs/13575743025/job/37951438546

Testing

I created a Pre-release tag on this bugfix branch to make sure that these changes would pass the goreleaser GitHub Action.
https://github.com/fidelity/kconnect/actions/runs/13640814861

This branch can be deleted once it is merged.