fix: Use https protocol as unauthenticated git protocol is no longer …

…supported (#1680)

* Use the https protocol to clone Git repositories over the
unauthenticated git protocol (git://) as it is no longer
supported on GitHub as of 2021-11-02.
   - c.f. https://github.blog/2021-09-01-improving-git-protocol-security-github/

.github/workflows/dependencies-head.yml

@@ -83,7 +83,7 @@ jobs:
         python -m pip --no-cache-dir --quiet install --upgrade .[test]
         python -m pip uninstall --yes iminuit
         python -m pip install --upgrade cython
-        python -m pip install --upgrade git+git://github.com/scikit-hep/iminuit.git
+        python -m pip install --upgrade git+https://github.com/scikit-hep/iminuit.git
         python -m pip list
     - name: Test with pytest
       run: |
@@ -108,7 +108,7 @@ jobs:
         python -m pip install --upgrade pip setuptools wheel
         python -m pip --no-cache-dir --quiet install --upgrade .[test]
         python -m pip uninstall --yes uproot
-        python -m pip install --upgrade git+git://github.com/scikit-hep/uproot4.git
+        python -m pip install --upgrade git+https://github.com/scikit-hep/uproot4.git
         python -m pip list
     - name: Test with pytest
       run: |
@@ -133,7 +133,7 @@ jobs:
         python -m pip install --upgrade pip setuptools wheel
         python -m pip --no-cache-dir --quiet install --upgrade .[test]
         python -m pip uninstall --yes pytest
-        python -m pip install --upgrade git+git://github.com/pytest-dev/pytest.git
+        python -m pip install --upgrade git+https://github.com/pytest-dev/pytest.git
         python -m pip list
     - name: Test with pytest
       run: |