Fix signKotlinMultiplatformPublication on CI (#1125)

Regression after https://github.com/JetBrains/skiko/pull/1119 was added
on CI

```
org.gradle.internal.execution.WorkValidationException: A problem was found with the configuration of task ':signKotlinMultiplatformPublication' (type 'Sign').
  - Gradle detected a problem with the following location: '/mnt/agent/work/381d14fe560aa354/skiko/build/libs/skiko-0.9.33-javadoc.jar.asc'.

    Reason: Task ':publishAwtRuntimeElementsPublicationToComposeRepoRepository' uses this output of task ':signKotlinMultiplatformPublication' without declaring an explicit or implicit dependency. This can lead to incorrect results being produced, depending on what order the tasks are executed.

    Possible solutions:
      1. Declare task ':signKotlinMultiplatformPublication' as an input of ':publishAwtRuntimeElementsPublicationToComposeRepoRepository'.
      2. Declare an explicit dependency on ':signKotlinMultiplatformPublication' from ':publishAwtRuntimeElementsPublicationToComposeRepoRepository' using Task#dependsOn.
      3. Declare an explicit dependency on ':signKotlinMultiplatformPublication' from ':publishAwtRuntimeElementsPublicationToComposeRepoRepository' using Task#mustRunAfter.
```

The fix is blind as we can only test it in master

skiko/buildSrc/src/main/kotlin/tasks/configuration/CommonTasksConfiguration.kt

@@ -269,8 +269,10 @@ fun Project.configureSignAndPublishDependencies() {
     tasks.configureEach {
         val publishKmp = "publishKotlinMultiplatformPublicationTo"
         val publishAwt = "publishAwtPublicationTo"
+        val publishAwtRuntimeElements = "publishAwtRuntimeElementsPublicationTo"
         val signKmp = "signKotlinMultiplatformPublication"
         val signAwt = "signAwtPublication"
+        val signAwtRuntimeElements = "signAwtRuntimeElements"
 
         when {
             name.startsWith(publishKmp) -> {
@@ -279,6 +281,9 @@ fun Project.configureSignAndPublishDependencies() {
             name.startsWith(publishAwt) -> {
                 dependsOn(signKmp)
             }
+            name.startsWith(publishAwtRuntimeElements) -> {
+                dependsOn(signAwtRuntimeElements)
+            }
         }
     }
 }