Remove deprecated pip repositories Bazel call

[jamesreprise]

What is the goal of this PR?

We remove an unneccessary call of pip_repositories despite it being a deprecated function from rules_python, including in our own patched version. Additionally, this cleans up our bazel command output. See the output message below.

DEBUG: /private/var/tmp/[...]/external/rules_python/python/pip.bzl:228:10: 
DEPRECATED: the pip_repositories rule has been replaced with pip_install, please see rules_python 0.1 release notes

See this dependencies PR for more information:

• https://github.com/vaticle/dependencies/pull/372

What are the changes implemented in this PR?

We remove the command that loads the function as well as the call to the function.

[grabl]

PR Review Checklist

Do not edit the content of this comment. The PR reviewer should simply update this comment by ticking each review item below, as they get completed.

---

Code

• [x] Packages, classes, and methods have a single domain of responsibility.
• [x] Packages, classes, and methods are grouped into cohesive and consistent domain model.
• [x] The code is canonical and the minimum required to achieve the goal.
• [x] Modules, libraries, and APIs are easy to use, robust (foolproof and not errorprone), and tested.
• [x] Logic and naming has clear narrative that communicates the accurate intent and responsibility of each module (e.g. method, class, etc.).
• [x] The code is algorithmically efficient and scalable for the whole application.

Architecture

• [x] Any required refactoring is completed, and the architecture does not introduce technical debt incidentally.
• [x] Any required build and release automations are updated and/or implemented.
• [x] Any new components follows a consistent style with respect to the pre-existing codebase.
• [x] The architecture intuitively reflects the application domain, and is easy to understand.
• [x] The architecture has a well-defined hierarchy of encapsulated components.
• [x] The architecture is extensible and scalable.