Update tests to java11

Author: rikgibson

integration-tests/funcs/flowExitHooks/func.yaml

@@ -1,7 +1,7 @@
 schema_version: 20180708
 name: flowexithooks
 version: 0.0.3
-runtime: java9
+runtime: java11
 cmd: com.fnproject.fn.integration.test_5.CompleterFunction::handleRequest
 format: http-stream
 timeout: 120

integration-tests/funcs/flowTimeouts/func.yaml

@@ -1,7 +1,7 @@
 schema_version: 20180708
 name: flowtimeouts
 version: 0.0.3
-runtime: java9
+runtime: java11
 cmd: com.fnproject.fn.integration.test_6.CompleterFunction::handleRequest
 format: http-stream
 timeout: 120

integration-tests/funcs/simpleFunc/func.yaml

@@ -1,6 +1,6 @@
 schema_version: 20180708
 name: simplefunc
 version: 0.0.3
-runtime: java9
+runtime: java11
 cmd: com.fnproject.fn.integration.test2.PlainFunction::handleRequest
 format: http-stream