Add OpenSSL 4.0.0 support to build and test configurations

- Add OpenSSL 4.0.0 to the build matrix in build.yml
- Add "4.0.0" to the OpenSSL versions list in multissltests.py

Author: clin1234

.github/workflows/build.yml

@@ -283,6 +283,7 @@ jobs:
           - { name: openssl, version: 3.4.4 }
           - { name: openssl, version: 3.5.5 }
           - { name: openssl, version: 3.6.1 }
+          - { name: openssl, version: 4.0.0 }
           ## AWS-LC
           - { name: aws-lc, version: 1.68.0 }
     env:

Tools/ssl/multissltests.py

@@ -54,6 +54,7 @@
     "3.4.4",
     "3.5.5",
     "3.6.1",
+    "4.0.0",
     # See make_ssl_data.py for notes on adding a new version.
 ]