chore(ci): remove one unused publishing config (#1510)

There are two configs, the other one is in
https://github.com/typesafegithub/github-workflows-kt/blob/ab02d5383a06889801d25b96e98639fa6688497e/build.gradle.kts#L11.
Ideally I'd like to remove this one so that publishing-related config is
kept in a single place, but this one is actually used. It's easier for
me to test removing something that is not used.

Author: krzema12

buildSrc/src/main/kotlin/buildsrc/convention/publishing.gradle.kts

@@ -45,22 +45,6 @@ publishing {
             }
         }
     }
-
-    val ossrhUsername: String? by project
-    val ossrhPassword: String? by project
-
-    repositories {
-        maven {
-            val releasesRepoUrl = uri("https://s01.oss.sonatype.org/service/local/staging/deploy/maven2/")
-            val snapshotsRepoUrl = uri("https://s01.oss.sonatype.org/content/repositories/snapshots/")
-            url = if (!project.version.toString().endsWith("-SNAPSHOT")) releasesRepoUrl else snapshotsRepoUrl
-
-            credentials {
-                username = ossrhUsername
-                password = ossrhPassword
-            }
-        }
-    }
 }
 
 signing {