Merge pull request #110775 from dotlambda/opentsdb-insecure

opentsdb: mark as insecure

pkgs/tools/misc/opentsdb/default.nix

···
     license = licenses.lgpl21Plus;
     platforms = lib.platforms.linux;
     maintainers = [ ];
+    knownVulnerabilities = [
+      "CVE-2020-35476" # https://github.com/OpenTSDB/opentsdb/issues/2051
+    ];
   };
 }