Bump dependency versions

- numpy
  - Dependabot whinges at me every week that 1.20 is insecure, so
    we should bump the minimum to 1.22.
  - We should let it go up to v2.
    We should expect to see some numpy API changes there that we'll have
    to assess, but nothing big should change before.
- pandas
  - Not sure why this was restricted
- python
  - I'm (non-critically) relying on the insertion-ordering of dict (part of the
    implementation specifications in 3.7) for presenting the Solver options
    in this PR, so >=3.7 is a reasonable restriction.
  - If the user is putting cplex in, then conda will restrict
    to a compatible python.

pyproject.toml

@@ -4,5 +4,5 @@ requires = [
 	"setuptools",  # PEP 508 specifications.
 	"wheel",       # PEP 508 specifications.
 	"setuptools_scm",
-	"numpy>=1.20,<1.22",
+	"numpy>=1.22,<2",
 ]

setup.py

@@ -25,9 +25,9 @@ def main():
         "setuptools_scm",
     ]
     install_requires = [
-        "numpy>=1.20,<1.22",
+        "numpy>=1.22,<2",
         "scipy>=1.0",
-        "pandas>=1.2,<1.4",
+        "pandas>=1.2",
         "pyparsing>=2.2.0",
         "tqdm>=4.0.0",
     ]
@@ -49,7 +49,7 @@ def main():
             "osqp": ["osqp", "miosqp @ git+https://github.com/osqp/miosqp.git@ac672338b0593d865dd15b7a76434f25e24244a9#egg=miosqp"],
         },
         zip_safe=False,
-        python_requires=">=3.6",
+        python_requires=">=3.7",
         entry_points={
             "console_scripts": [
                 "qfit_protein = qfit.qfit_protein:main",