Fix dev dependencies

The driver has support for pandas >=1.1, <2, but as optional dependencies.
If not specified (`pip install neo4j[pandas]`), but installed directly
(`pip install pandas`), the version bounds of the driver will not be respected.

Author: robsdedude

requirements-dev.txt

@@ -1,5 +1,5 @@
 # the driver itself
--e .
+-e .[pandas,numpy]
 
 # auto-generate sync driver from async code
 unasync>=0.5.0
@@ -18,8 +18,6 @@ tomlkit~=0.11.6
 # needed for running tests
 coverage[toml]>=5.5
 mock>=4.0.3
-numpy>=1.7.0
-pandas>=1.0.0
 pyarrow>=1.0.0
 pytest>=6.2.5
 pytest-asyncio>=0.16.0