Restore original epicscorelibs dependency

With the release of p4p 3.5.5 there is no longer a version conflict.

See discussion here: #60 (comment)

Author: AlexanderWells-diamond

pyproject.toml

@@ -1,3 +1,3 @@
 [build-system]
-requires = ["setuptools", "wheel", "setuptools_dso>=2.1", "epicscorelibs==7.0.6.99.1.0"]
+requires = ["setuptools", "wheel", "setuptools_dso>=2.1", "epicscorelibs>=7.0.6.99.1.0"]
 build-backend = "setuptools.build_meta:__legacy__"