fix: library/pom.xml to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-1534563
- https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-3042244
- https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-3092936

library/pom.xml

@@ -20,7 +20,7 @@
 		<!-- Default extra plugins enabled -->
 		<ckeditor-extra-plugins>sakaipreview,sakaidropdowntoolbar,sakaiopenlink,</ckeditor-extra-plugins>
 		<!-- Empty defaults for a11y-->
-		<ckeditor-a11y-extra-plugins></ckeditor-a11y-extra-plugins>
+		<ckeditor-a11y-extra-plugins/>
 	</properties>
 	<dependencies>
 		<dependency>
@@ -277,7 +277,7 @@
 		<dependency>
 			<groupId>org.webjars.npm</groupId>
 			<artifactId>video.js</artifactId>
-			<version>7.14.0</version>
+			<version>7.15.6</version>
 		</dependency>
 		<!--Used in Tests&Quizzes, validation of fill in numeric questions -->
 		<dependency>