Apply suggested pyproject.toml changes in issue #408

pyproject.toml

@@ -34,18 +34,18 @@ fawltydeps = "fawltydeps.main:main"
 [tool.poetry.dependencies]
 # These are the main dependencies for fawltydeps at runtime.
 # Do not add anything here that is only needed by CI/tests/linters/developers
-python = "^3.7.2"
-importlib_metadata = "=6.6.0"
+python = ">=3.7.2"
+importlib_metadata = ">=6.6.0"
 isort = [
     # isort 5.12.0 drops support for Python v3.7:
     {version = "^5.10", python = ">=3.8"},
     {version = ">=5.10,<5.12.0", python = "<3.8"},
 ]
-pip-requirements-parser = "^32.0.1"
+pip-requirements-parser = ">=32.0.1"
 pydantic = ">=1.10.4,<3.0.0"
 tomli = {version = "^2.0.1", python = "<3.11"}
-typing-extensions = {version = "^4.4.0", python = "<3.8"}
-setuptools = "^68.0.0"
+typing-extensions = {version = ">=4.4.0", python = "<3.8"}
+setuptools = ">=68.0.0"
 
 [tool.poetry.group.nox]
 optional = true