setup: do not use a fixed urllib3 version

* ref: cern-sis/issues-inspire#521

.github/workflows/test-python-2.yml

@@ -23,7 +23,6 @@ jobs:
           wget https://bootstrap.pypa.io/pip/2.7/get-pip.py
           ${{ matrix.python }} get-pip.py
           ${{ matrix.python }} -m ${{ matrix.pip }} install --user --upgrade pip
-          ${{ matrix.python }} -m ${{ matrix.pip }} --no-cache-dir install --user setuptools wheel "urllib3==1.25.11"
           ${{ matrix.python }} -m ${{ matrix.pip }} --no-cache-dir install --user -e .[tests,elasticsearch5]
 
       - name: Show python dependencies

setup.py

@@ -36,8 +36,7 @@
     'nameparser~=1.1,>=1.1.3; python_version >= "3.6"',
     "python-dateutil~=2.0,>=2.6.1",
     "six~=1.0,>=1.10.0",
-    "urllib3~=1.0,<=1.26.12",
-    "inspire_schemas",
+    "inspire_schemas @ git+https://github.com/miguelgrc/inspire-schemas.git@bump-urllib3#egg=inspire_schemas",
     "scrapy",
     "pylatexenc",
 ]