chore(deps): update dependency io.ktor:ktor-bom to v1.6.7 (GoogleCloudPlatform#6555)

Author: renovate-bot

appengine-java11/kotlin-ktor/pom.xml

@@ -59,7 +59,7 @@ limitations under the License.
       <dependency>
         <groupId>io.ktor</groupId>
         <artifactId>ktor-bom</artifactId>
-        <version>1.6.6</version>
+        <version>1.6.7</version>
         <type>pom</type>
         <scope>import</scope>
       </dependency>