Bump jakarta.tck:sigtest-maven-plugin from 2.6 to 2.7

Bumps [jakarta.tck:sigtest-maven-plugin](https://github.com/eclipse-ee4j/jakartaee-tck-tools) from 2.6 to 2.7.
- [Release notes](https://github.com/eclipse-ee4j/jakartaee-tck-tools/releases)
- [Commits](https://github.com/eclipse-ee4j/jakartaee-tck-tools/commits)

---
updated-dependencies:
- dependency-name: jakarta.tck:sigtest-maven-plugin
  dependency-version: '2.7'
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

tck/pom.xml

diff --git a/tck/pom.xml b/tck/pom.xml
index 49ad915..384ceb9 100644
--- a/tck/pom.xml
+++ b/tck/pom.xml
@@ -108,7 +108,7 @@
         <dependency>
             <groupId>jakarta.tck</groupId>
             <artifactId>sigtest-maven-plugin</artifactId>
-            <version>2.6</version>
+            <version>2.7</version>
         </dependency>
     </dependencies>
 
@@ -228,7 +228,7 @@
                     <plugin>
                         <groupId>jakarta.tck</groupId>
                         <artifactId>sigtest-maven-plugin</artifactId>
-                        <version>2.6</version>
+                        <version>2.7</version>
                         <configuration>
                             <sigfile>${project.build.directory}/jakarta.el.sig_${api.version}</sigfile>
                             <packages>jakarta.el</packages>