BUILD: scripts: disable tests build on QuicTLS build

during CI builds QuicTLS is not cached, let us speed it up by
disabling tests build. Doing so saves ~40s out of 3m40.
diff --git a/scripts/build-ssl.sh b/scripts/build-ssl.sh
index 42eef19..4360adf 100755
--- a/scripts/build-ssl.sh
+++ b/scripts/build-ssl.sh
@@ -137,7 +137,7 @@
         download_quictls
         cd download-cache/quictls
 
-        ./config shared  ${QUICTLS_EXTRA_ARGS:-} --prefix="${HOME}/opt" --openssldir="${HOME}/opt" --libdir=lib -DPURIFY
+        ./config shared no-tests ${QUICTLS_EXTRA_ARGS:-} --prefix="${HOME}/opt" --openssldir="${HOME}/opt" --libdir=lib -DPURIFY
         make -j$(nproc) build_sw
         make install_sw