ci: Update Sonatype repository configuration for maven central. (#43)

<!-- CURSOR_SUMMARY -->
> [!NOTE]
> **Medium Risk**
> Moderate risk because it changes the Nexus publishing configuration
used for releases/snapshots; incorrect endpoints could break publishing
but does not affect runtime code.
> 
> **Overview**
> Updates Gradle `nexusPublishing` configuration to stop using the
default `sonatype()` shorthand and instead explicitly set the new
Sonatype Central staging (`nexusUrl`) and snapshot
(`snapshotRepositoryUrl`) endpoints, with the existing timeout
preserved.
> 
> <sup>Written by [Cursor
Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit
ac10dd3. This will update automatically
on new commits. Configure
[here](https://cursor.com/dashboard?tab=bugbot).</sup>
<!-- /CURSOR_SUMMARY -->

Author: kinyoklion

build.gradle

@@ -100,7 +100,10 @@ signing {
 nexusPublishing {
     clientTimeout = java.time.Duration.ofMinutes(2) // we've seen extremely long delays in creating repositories
     repositories {
-            sonatype()
+        sonatype{
+            nexusUrl.set(uri("https://ossrh-staging-api.central.sonatype.com/service/local/"))
+            snapshotRepositoryUrl.set(uri("https://central.sonatype.com/repository/maven-snapshots/"))
+        }
     }
 }