GUACAMOLE-1794: Update KSM SDK to 16.5.3 to add support for "passkey" field type.

(cherry picked from commit 2a9bbed2250be2087db8d4a276ff4140ac919888)

doc/licenses/ksm-sdk-16.5.3/LICENSE

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+MIT License
+
+Copyright (c) 2021 Keeper Security
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

doc/licenses/ksm-sdk-16.5.3/README

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+Keeper Secrets Manager Java SDK
+(https://github.com/Keeper-Security/secrets-manager)
+----------------------------------------------------
+
+    Version: 16.5.3
+    From: 'Keeper Security' (https://www.keepersecurity.com/)
+    License(s):
+        MIT (bundled/ksm-sdk-16.5.3/LICENSE)
+

doc/licenses/ksm-sdk-16.5.3/dep-coordinates.txt

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+com.keepersecurity.secrets-manager:core:jar:16.5.3