Bump org.apache.maven.plugins:maven-assembly-plugin in /tck

Bumps [org.apache.maven.plugins:maven-assembly-plugin](https://github.com/apache/maven-assembly-plugin) from 3.3.0 to 3.8.0.
- [Release notes](https://github.com/apache/maven-assembly-plugin/releases)
- [Commits](https://github.com/apache/maven-assembly-plugin/compare/maven-assembly-plugin-3.3.0...v3.8.0)

---
updated-dependencies:
- dependency-name: org.apache.maven.plugins:maven-assembly-plugin
  dependency-version: 3.8.0
  dependency-type: direct:production
  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 6cd5f0a..adc13ba 100644
--- a/tck/pom.xml
+++ b/tck/pom.xml
@@ -136,7 +136,7 @@
                 <plugin>
                     <groupId>org.apache.maven.plugins</groupId>
                     <artifactId>maven-assembly-plugin</artifactId>
-                    <version>3.7.1</version>
+                    <version>3.8.0</version>
                 </plugin>
                 <plugin>
                     <groupId>org.apache.maven.plugins</groupId>

tck/tck-docs/pom.xml

diff --git a/tck/tck-docs/pom.xml b/tck/tck-docs/pom.xml
index eb080ec..e0a8a36 100644
--- a/tck/tck-docs/pom.xml
+++ b/tck/tck-docs/pom.xml
@@ -36,7 +36,7 @@
         <maven.build.timestamp.format>MMMM dd, yyyy</maven.build.timestamp.format>
         <technology.version>2.2</technology.version>
         <maven-enforcer-plugin.version>3.0.0-M3</maven-enforcer-plugin.version>
-        <maven-assembly-plugin.version>3.3.0</maven-assembly-plugin.version>
+        <maven-assembly-plugin.version>3.8.0</maven-assembly-plugin.version>
         <maven-resources-plugin.version>3.3.1</maven-resources-plugin.version>
     </properties>