repo: Pin dependencies

This fixes an issue with slixmpp > 1.7.1

setup.py

@@ -9,10 +9,10 @@ setup(
     license = "GPLc3",
     packages = find_packages(),
     install_requires = [
-        "requests>=2.26.0",
-        "slixmpp>=1.7.1",
+        "requests==2.27.1",
+        "slixmpp==1.7.1",
         "nextcord",
-        "toml>=0.10.2"
+        "toml==0.10.2"
     ],
     extra_require = {
         "dev": [