Remove the pybind11 submodule and update the long description and supported Python versions

Author: Huelse

.gitmodules

@@ -2,7 +2,3 @@
 	path = SEAL
 	url = https://github.com/microsoft/SEAL.git
 	branch = main
-[submodule "pybind11"]
-	path = pybind11
-	url = https://github.com/pybind/pybind11.git
-	branch = stable

pybind11

@@ -72,7 +72,7 @@ def _copy_typing_files(self):
     author_email="topmaxz@protonmail.com",
     url="https://github.com/Huelse/SEAL-Python",
     description="Python wrapper for the Microsoft SEAL",
-    long_description=(BASE_DIR / "README.md").read_text(encoding="utf-8"),
+    long_description=(BASE_DIR / "README.md").read_text(encoding="utf-8")[:528],
     long_description_content_type="text/markdown",
     ext_modules=ext_modules,
     cmdclass={"build_ext": build_ext_with_typing},
@@ -91,6 +91,8 @@ def _copy_typing_files(self):
         "Programming Language :: Python :: 3.10",
         "Programming Language :: Python :: 3.11",
         "Programming Language :: Python :: 3.12",
+        "Programming Language :: Python :: 3.13",
+        "Programming Language :: Python :: 3.14",
         "Programming Language :: C++",
         "Topic :: Security :: Cryptography",
     ],