Upgrade to Jetty El 8.5.54

Closes gh-21340

Author: snicoll

spring-boot-project/spring-boot-dependencies/pom.xml

@@ -127,7 +127,7 @@
 		<jest.version>6.3.1</jest.version>
 		<jetty.version>9.4.28.v20200408</jetty.version>
 		<jetty-jsp.version>2.2.0.v201112011158</jetty-jsp.version>
-		<jetty-el.version>8.5.49</jetty-el.version>
+		<jetty-el.version>8.5.54</jetty-el.version>
 		<jetty-reactive-httpclient.version>1.0.3</jetty-reactive-httpclient.version>
 		<jmustache.version>1.15</jmustache.version>
 		<jna.version>4.5.2</jna.version>