ci: Unpin Unexecuted Dependencies (#1548)

PyYAML and requests dependencies aren't ever directly executed and are
only pulled within CI systems to avoid import errors in pylint. Keeping
pinned dependencies for Python packages executed directly to avoid
randomly picking up breaking changes.

.github/workflows/python-lint.yml

@@ -24,7 +24,7 @@ jobs:
           python-version: '3.7'
       - name: Install Dependencies
         run: |
-          pip install black==19.10b0 PyYAML==5.1.2 requests==2.22.0
+          pip install black==19.10b0
       - name: black **/*.py --line-length 100 --check --diff
         run: |
           black **/*.py --line-length 100 --check --diff
@@ -42,7 +42,7 @@ jobs:
           echo "::add-matcher::.github/matchers/${{ github.job }}.json"
       - name: Install Dependencies
         run: | # TODO: Update pylint version to one that natively caps isort dependency
-          pip install pylint==2.2.3 isort==4.3.21 PyYAML==5.1.2 requests==2.22.0
+          pip install pylint==2.2.3 isort==4.3.21 PyYAML requests
       - name: pylint **/*.py --errors-only
         run: |
           pylint **/*.py --errors-only