Revert "CI: update to the latest WolfSSL version"

This reverts commit 03f57fcf94dae61906b56d10d1fb21f7afaae4fc.

Looks like the 5.7.4 version is broke with HAProxy, let's revert the CI
for now.

diff --git a/.github/matrix.py b/.github/matrix.py
index e576a29..130eda2 100755 (executable)
--- a/.github/matrix.py
+++ b/.github/matrix.py
@@ -188,7 +188,7 @@ def main(ref_name):
             "OPENSSL_VERSION=1.0.2u",
             "OPENSSL_VERSION=1.1.1s",
             "QUICTLS=yes",
-            "WOLFSSL_VERSION=5.7.4",
+            "WOLFSSL_VERSION=5.7.0",
             "AWS_LC_VERSION=1.39.0",
             # "BORINGSSL=yes",
         ]