Bump package version to 0.4.1 and update Python requirement

- Update version in pyproject.toml and setup.py to 0.4.1
- Modify Python requirement to >=3.12 in setup.py

Author: howethomas

pyproject.toml

@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "vcon"
-version = "0.4.0"
+version = "0.4.1"
 description = "The vCon library"
 authors = ["Thomas McCarthy-Howe <ghostofbasho@gmail.com>"]
 license = "MIT"

setup.py

@@ -5,7 +5,7 @@
 
 setup(
     name="vcon",
-    version="0.3.10",
+    version="0.4.1",
     author="Thomas McCarthy-Howe",
     author_email="ghostofbasho@gmail.com",
     description="A package for working with vCon containers",
@@ -18,5 +18,5 @@
         "License :: OSI Approved :: MIT License",
         "Operating System :: OS Independent",
     ],
-    python_requires=">=3.6",
+    python_requires=">=3.12",
 )