CU-86967nnra Drop python 3.8 support (EoL) (#498)

* CU-86967nnra: Remove python 3.8 from GHA

* CU-86967nnra: Remove python 3.8 from classifiers

* CU-86967nnra: Add python version requirements to setup.py (allowing from 3.9 to 3.11)

* CU-86967nnra: Remove upper bound from python requirements.

Upper bound could be lifted as soon as `spacy` releases a compatible versions. And it _shouldn't_ require any changes from our side. And it isn't possible to install it on higher versions (currently) due to no `spacy` being available for those versions

.github/workflows/main.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [ '3.8', '3.9', '3.10', '3.11' ]
+        python-version: [ '3.9', '3.10', '3.11' ]
       max-parallel: 4
 
     steps:

setup.py

@@ -27,12 +27,12 @@
     packages=['medcat', 'medcat.utils', 'medcat.preprocessing', 'medcat.ner', 'medcat.linking', 'medcat.datasets',
               'medcat.tokenizers', 'medcat.utils.meta_cat', 'medcat.pipeline', 'medcat.utils.ner', 'medcat.utils.relation_extraction',
               'medcat.utils.saving', 'medcat.utils.regression', 'medcat.stats'],
+    python_requires='>=3.9', # 3.8 is EoL
     install_requires=install_requires,
     include_package_data=True,
     package_data={"medcat": ["install_requires.txt"]},
     classifiers=[
         "Programming Language :: Python :: 3",
-        "Programming Language :: Python :: 3.8",
         "Programming Language :: Python :: 3.9",
         "Programming Language :: Python :: 3.10",
         "Programming Language :: Python :: 3.11",