build: install GitHub-hosted dependencies as wheels

We update github.in to use the proper git-based depencency
format specified in the file comment. This format installs
a package as a pre-built wheel:

    git+https://github.com/...

instead of a development-mode editable requirement:

   -e https://github.com/...

Installing packages in editable mode increases the amount of time
it takes to install edx-platform  dependencies, increases the
resulting virtual environment's size, and installs packages in a
way that has several subtle differences compared to the way
wheels are installed:
https://setuptools.pypa.io/en/latest/userguide/development_mode.html#limitations

requirements/edx/github.in

@@ -65,13 +65,19 @@
 #     tight-loop work in progress.
 #
 #   * Alphabetize dependencies by DIST-NAME.
--e git+https://github.com/openedx/[email protected].1#egg=blockstore==1.2.1  # Note: Blockstore 1.2.2 is failing.
--e git+https://github.com/openedx/[email protected]#egg=codejail==3.1.3
-git+https://github.com/openedx/django-require.git@0c54adb167142383b26ea6b3edecc3211822a776#egg=django-require==1.0.12
--e git+https://github.com/openedx/[email protected]#egg=django-wiki
+#git+https://github.com/openedx/[email protected].5#egg=blockstore==1.2.5  # See blockstore comment below.
+git+https://github.com/openedx/[email protected]#egg=codejail==3.1.3
+git+https://github.com/openedx/django-require.git@f4f01e4e959adc6210873ae99e7f2c3741afbf35#egg=django-require==1.0.12
+git+https://github.com/openedx/[email protected]#egg=django-wiki
 git+https://github.com/openedx/MongoDBProxy.git@d92bafe9888d2940f647a7b2b2383b29c752f35a#egg=MongoDBProxy==0.1.0+edx.2
--e git+https://github.com/openedx/olxcleaner.git@2f0d6c7f126cbd69c9724b7b57a0b2565330a297#egg=olxcleaner
--e git+https://github.com/openedx/[email protected]#egg=rate-xblock
+git+https://github.com/openedx/olxcleaner.git@2f0d6c7f126cbd69c9724b7b57a0b2565330a297#egg=olxcleaner
+git+https://github.com/openedx/[email protected]#egg=rate-xblock
 git+https://github.com/openedx/[email protected]#egg=xblock-drag-and-drop-v2==2.3.5
--e git+https://github.com/openedx/xblock-google-drive.git@2d176468e33c0713c911b563f8f65f7cf232f5b6#egg=xblock-google-drive
+git+https://github.com/openedx/xblock-google-drive.git@2d176468e33c0713c911b563f8f65f7cf232f5b6#egg=xblock-google-drive
 git+https://github.com/open-craft/[email protected]#egg=xblock-poll==1.12.0
+
+# This will be converted to the correct format (git+https://...) soon.
+# We must upgrade to blockstore>=1.2.5 in order to use the correct format, though,
+# which is in progress.
+# Relevant PR: https://github.com/openedx/edx-platform/pull/30620
+-e git+https://github.com/openedx/[email protected]#egg=blockstore==1.2.1