Bump typing-extensions to 4.8.0

This brings in a fix for python 3.12:

python/typing_extensions#162

Author: ghickman

requirements.prod.txt

@@ -885,9 +885,9 @@ typeguard==2.13.3 \
     --hash=sha256:00edaa8da3a133674796cf5ea87d9f4b4c367d77476e185e80251cc13dfbb8c4 \
     --hash=sha256:5e3e3be01e887e7eafae5af63d1f36c849aaa94e3a0112097312aabfa16284f1
     # via slippers
-typing-extensions==4.4.0 \
-    --hash=sha256:1511434bb92bf8dd198c12b1cc812e800d4181cfcb867674e0f8279cc93087aa \
-    --hash=sha256:16fa4864408f655d35ec496218b85f79b3437c829e93320c7c9215ccfd92489e
+typing-extensions==4.8.0 \
+    --hash=sha256:8f92fc8806f9a6b641eaa5318da32b44d401efaac0f6678c9bc448ba3605faa0 \
+    --hash=sha256:df8e4339e9cb77357558cbdbceca33c303714cf861d1eef15e1070055ae8b7ef
     # via
     #   dj-database-url
     #   opentelemetry-sdk