GUACAMOLE-773: Update Java dependencies to latest stable, compatible versions.

doc/licenses/spring-framework-5.3.14/README

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+Spring Framework (https://spring.io/projects/spring-framework)
+--------------------------------------------------------------
+
+    Version: 5.3.14
+    From: 'Spring' (https://spring.io/)
+    License(s):
+        Apache v2.0
+

doc/licenses/spring-framework-5.3.14/dep-coordinates.txt

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+org.springframework:spring-aop:jar:5.3.14
+org.springframework:spring-beans:jar:5.3.14
+org.springframework:spring-context:jar:5.3.14
+org.springframework:spring-core:jar:5.3.14
+org.springframework:spring-expression:jar:5.3.14
+org.springframework:spring-jcl:jar:5.3.14
+org.springframework:spring-web:jar:5.3.14