resolve py3.6 CVEs

[jmeixensperger]

Resolves the following CVEs:

CVE-2019-20916 / CVE-2021-3572       HIGH        pkg:pypi/pip@9.0.3
CVE-2024-6345 / CVE-202240897        HIGH        pkg:pypi/setuptools@39.2.0
CVE-2023-32681                       MED         pkg:pypi/requests@2.28.2

I observed that the glib2-devel depends on and installs python 3.6. This was also installing rpm packages for the pip and setuptools versions reported above. Removing the relevant rpm packages did not resolve the CVEs, and I verified that the image build worked fine without glib2-devel.

I also removed the version pin for the requests package on the base layer. It's important to note that the Splunk product may install its own version(s) of requests depending on the build, however this will not affect the version we install via pip.