CI: github actions: switch to LibreSSL-3.5.1

(cherry picked from commit 2ec39ea6534827bacfbd50812d7514299a28da9b)
Signed-off-by: Christopher Faulet <cfaulet@haproxy.com>
(cherry picked from commit 3d7f86326a01750ba3d28ca51570b2d44a52cec8)
Signed-off-by: Christopher Faulet <cfaulet@haproxy.com>
diff --git a/.github/matrix.py b/.github/matrix.py
index 74bfcc7..e17551e 100644
--- a/.github/matrix.py
+++ b/.github/matrix.py
@@ -110,7 +110,7 @@
         "OPENSSL_VERSION=1.0.2u",
         "OPENSSL_VERSION=3.0.1",
         "LIBRESSL_VERSION=2.9.2",
-        "LIBRESSL_VERSION=3.3.3",
+        "LIBRESSL_VERSION=3.5.1",
 #        "BORINGSSL=yes",
     ]:
         flags = ["USE_OPENSSL=1"]