fix: correct release-please-config for invoker/conformance/pom.xml

Previous change d31b502 incorrectly added an extra file to the invoker
release which is causing automation breakages when the invoker release
PRs are created. The extra file should actually have been added to the
maven-plugin package as that is the release that bumps that version.

Move config to the right package.

Author: maemayve

.github/release-please-config.json

@@ -46,11 +46,6 @@
                     "path": "conformance/pom.xml",
                     "xpath": "//*[local-name()='artifactId' and text()='conformance']/parent::*/*[local-name()='version']"
                 },
-                {
-                    "type": "xml",
-                    "path": "conformance/pom.xml",
-                    "xpath": "//*[local-name()='artifactId' and text()='function-maven-plugin']/parent::*/*[local-name()='version']" 
-                },
                 {
                     "type": "xml",
                     "path": "testfunction/pom.xml",
@@ -71,6 +66,11 @@
                     "type": "xml",
                     "path": "pom.xml",
                     "xpath": "//*[local-name()='artifactId' and text()='function-maven-plugin']/parent::*/*[local-name()='version']"
+                },
+                {
+                    "type": "xml",
+                    "path": "../invoker/conformance/pom.xml",
+                    "xpath": "//*[local-name()='artifactId' and text()='function-maven-plugin']/parent::*/*[local-name()='version']" 
                 }
             ]
         }