chore(deny): remove unused license allowances (#221)

* chore(deny): remove unused license allowances

MIT-0, Unicode-DFS-2016, CC0-1.0, MPL-2.0, and OpenSSL are not
present in the dependency tree and produce cargo-deny warnings.

* chore(deny): remove dead ring license clarify block

The LICENSE file hash no longer matches ring v0.17.14, so the
clarify block was silently ignored. Ring's Cargo.toml metadata
(Apache-2.0 AND ISC) is used instead.

Author: shiv-tyagi

deny.toml

@@ -9,29 +9,19 @@ confidence-threshold = 0.8
 
 allow = [
     "MIT",
-    "MIT-0",
     "Apache-2.0",
     "Apache-2.0 WITH LLVM-exception",
     "BSD-2-Clause",
     "BSD-3-Clause",
     "0BSD",
     "ISC",
     "Unicode-3.0",
-    "Unicode-DFS-2016",
     "Zlib",
     "BSL-1.0",
-    "CC0-1.0",
     "Unlicense",
-    "MPL-2.0",
-    "OpenSSL",
     "CDLA-Permissive-2.0",
 ]
 
-[[licenses.clarify]]
-name = "ring"
-expression = "MIT AND ISC AND OpenSSL"
-license-files = [{ path = "LICENSE", hash = 0xbd0eed23 }]
-
 [bans]
 multiple-versions = "warn"
 wildcards = "deny"