Update dependencies for apple silicon in macos.rst

[Adhyyan1252]

Overview: What does this pull request change?

Adds pkg-config to the list of needed dependencies for apple silicon.
According to https://pypi.org/project/ManimPango/ manim-pango needs pkg-config

Motivation and Explanation: Why and how do your changes improve the library?

Running into an error when executing pip3 install manim on apple silicon
Adding pkg-config resolved this issue for me.

pip3 install manim
Collecting manim
  ...
  Building wheel for manimpango (pyproject.toml) ... error
  error: subprocess-exited-with-error

  × Building wheel for manimpango (pyproject.toml) did not run successfully.
  │ exit code: 1
  ╰─> [41 lines of output]
      ....
      running build_ext
      building 'manimpango.cmanimpango' extension
      creating build/temp.macosx-13-arm64-cpython-311
      creating build/temp.macosx-13-arm64-cpython-311/private
      creating build/temp.macosx-13-arm64-cpython-311/private/var
      creating build/temp.macosx-13-arm64-cpython-311/private/var/folders
      creating build/temp.macosx-13-arm64-cpython-311/private/var/folders/6l
      creating build/temp.macosx-13-arm64-cpython-311/private/var/folders/6l/srywjz3d2rl9dm5xfxtgvy040000gn
      creating build/temp.macosx-13-arm64-cpython-311/private/var/folders/6l/srywjz3d2rl9dm5xfxtgvy040000gn/T
      creating build/temp.macosx-13-arm64-cpython-311/private/var/folders/6l/srywjz3d2rl9dm5xfxtgvy040000gn/T/pip-install-nfcb0_az
      creating build/temp.macosx-13-arm64-cpython-311/private/var/folders/6l/srywjz3d2rl9dm5xfxtgvy040000gn/T/pip-install-nfcb0_az/manimpango_0a111173a7d647f3a66a8906a30bf4e9
      creating build/temp.macosx-13-arm64-cpython-311/private/var/folders/6l/srywjz3d2rl9dm5xfxtgvy040000gn/T/pip-install-nfcb0_az/manimpango_0a111173a7d647f3a66a8906a30bf4e9/manimpango
      clang -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -isysroot /Library/Developer/CommandLineTools/SDKs/MacOSX13.sdk -I/opt/homebrew/opt/[email protected]/Frameworks/Python.framework/Versions/3.11/include/python3.11 -c /private/var/folders/6l/srywjz3d2rl9dm5xfxtgvy040000gn/T/pip-install-nfcb0_az/manimpango_0a111173a7d647f3a66a8906a30bf4e9/manimpango/cmanimpango.c -o build/temp.macosx-13-arm64-cpython-311/private/var/folders/6l/srywjz3d2rl9dm5xfxtgvy040000gn/T/pip-install-nfcb0_az/manimpango_0a111173a7d647f3a66a8906a30bf4e9/manimpango/cmanimpango.o
      /private/var/folders/6l/srywjz3d2rl9dm5xfxtgvy040000gn/T/pip-install-nfcb0_az/manimpango_0a111173a7d647f3a66a8906a30bf4e9/manimpango/cmanimpango.c:773:10: fatal error: 'cairo.h' file not found
      #include "cairo.h"
               ^~~~~~~~~
      1 error generated.
      error: command '/usr/bin/clang' failed with exit code 1
      [end of output]

  note: This error originates from a subprocess, and is likely not a problem with pip.
  ERROR: Failed building wheel for manimpango
Failed to build manimpango
ERROR: Could not build wheels for manimpango, which is required to install pyproject.toml-based projects

Links to added or changed documentation pages

Further Information and Comments

Reviewer Checklist

• The PR title is descriptive enough for the changelog, and the PR is labeled correctly
• If applicable: newly added non-private functions and classes have a docstring including a short summary and a PARAMETERS section
• If applicable: newly added functions and classes are tested

[behackl]

While the absence of pkg-config usually produces a different error compared to the one you report, installing it as a dependency does not necessarily hurt. Thanks for your contribution!