Remove tests-cryptography-main for Python 3.8 (pyca#1496)

Author: alex

.github/workflows/ci.yml

@@ -23,7 +23,6 @@ jobs:
           - {VERSION: "3.11", NOXSESSION: "tests-wheel", OS: "windows-latest"}
           - {VERSION: "3.14t", NOXSESSION: "tests-wheel", OS: "windows-latest"}
           # -cryptography-main
-          - {VERSION: "3.8", NOXSESSION: "tests-cryptography-main"}
           - {VERSION: "3.9", NOXSESSION: "tests-cryptography-main"}
           - {VERSION: "3.10", NOXSESSION: "tests-cryptography-main"}
           - {VERSION: "3.11", NOXSESSION: "tests-cryptography-main"}