chore: Fix license metadata in setup.py (#5934)

### Description

See [PEP 639](https://peps.python.org/pep-0639/#deprecate-license-field)
for deprecation of `license` and license in classifiers in favor of
`license_expression`.

#### Issues

* resolves: #5932
* resolves: PY-2276

Author: sl0thentr0py

setup.py

@@ -36,7 +36,7 @@ def get_file_text(file_name):
     # PEP 561
     package_data={"sentry_sdk": ["py.typed"]},
     zip_safe=False,
-    license="MIT",
+    license_expression="MIT",
     python_requires=">=3.6",
     install_requires=[
         "urllib3>=1.26.11",
@@ -99,7 +99,6 @@ def get_file_text(file_name):
         "Development Status :: 5 - Production/Stable",
         "Environment :: Web Environment",
         "Intended Audience :: Developers",
-        "License :: OSI Approved :: BSD License",
         "Operating System :: OS Independent",
         "Programming Language :: Python",
         "Programming Language :: Python :: 3",