cargo-deny: allow the MPL-2.0 and OpenSSL licenses (#6136)

* cargo-deny: allow the MPL-2.0 and OpenSSL licenses

These are required in order to merge https://github.com/bytecodealliance/wasmtime/pull/5929.

* deny.toml: add clarification of license for `ring`

deny.toml

@@ -17,9 +17,18 @@ allow = [
     "BSD-3-Clause",
     "ISC",
     "MIT",
+    "MPL-2.0",
+    "OpenSSL",
     "Zlib",
 ]
 
+[[licenses.clarify]]
+name = "ring"
+expression = "MIT AND ISC AND OpenSSL"
+license-files = [
+    { path = "LICENSE", hash = 0xbd0eed23 }
+]
+
 # https://embarkstudios.github.io/cargo-deny/checks/bans/cfg.html
 [bans]
 multiple-versions = "deny"