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:

• Add hash for OR-Tools, remove unneccessary pip repositories call typedb-dependencies#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]

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