Bump jetty-webapp from 7.6.14.v20131031 to 9.4.34.v20201102 in /plain-servlet#50

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dependabot/maven/plain-servlet/org.eclipse.jetty-jetty-webapp-9.4.34.v20201102HotswapProjects/HotswapAgentExamples:dependabot/maven/plain-servlet/org.eclipse.jetty-jetty-webapp-9.4.34.v20201102Copy head branch name to clipboard