Fix cargo-about for binary packages, part 2

Accept the openssl license, that's pulled in via the new dependency to
ring.

In reality this doesn't truly affect the binaries we distribute (as this
primarily comes in either as build dependency (skia) or for the energy
monitor via ureq.

scripts/prepare_binary_package.sh

@@ -90,6 +90,7 @@ accepted = [
     "BSL-1.0",
     "ISC",
     "Unicode-DFS-2016",
+    "OpenSSL",
     "GPL-3.0", # That's only for Slint
 ]
 targets = [