Use removePrefix instead of replace for multi-release prefix removal (#1972)

`String.replace` replaces all occurrences of the substring, not just the leading one. For multi-release JAR paths, only the leading `META-INF/versions/<n>/` prefix should be stripped before relocation.

- **`ShadowCopyAction.kt`**: Replace `path.replace(multiReleasePrefix, "")` with `path.removePrefix(multiReleasePrefix)` to correctly strip only the leading prefix.

```kotlin
// Before
val newPath = path.replace(multiReleasePrefix, "")

// After
val newPath = path.removePrefix(multiReleasePrefix)
```

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: Goooler <10363352+Goooler@users.noreply.github.com>

Author: Copilot

src/main/kotlin/com/github/jengelman/gradle/plugins/shadow/tasks/ShadowCopyAction.kt

@@ -177,8 +177,8 @@ constructor(
             with(fileDetails) {
               // Temporarily remove the multi-release prefix.
               val multiReleasePrefix = multiReleaseRegex.find(path)?.value.orEmpty()
-              val newPath = path.replace(multiReleasePrefix, "")
-              val relocatedPath = multiReleasePrefix + relocators.relocatePath(newPath)
+              val pathSuffix = path.removePrefix(multiReleasePrefix)
+              val relocatedPath = multiReleasePrefix + relocators.relocatePath(pathSuffix)
               writeToZip(entryName = relocatedPath, bytes = remapClass(relocators = relocators))
             }
           }