Replace uses of deprecated Gradle assignment syntax

build.gradle

@@ -140,11 +140,11 @@ publishing {
     maven {
       final releasesRepoUrl = "https://oss.sonatype.org/service/local/staging/deploy/maven2"
       final snapshotsRepoUrl = "https://oss.sonatype.org/content/repositories/snapshots"
-      url isSnapshot ? snapshotsRepoUrl : releasesRepoUrl
+      url = isSnapshot ? snapshotsRepoUrl : releasesRepoUrl
       if (project.hasProperty('ossrhUsername') && project.hasProperty('ossrhPassword')) {
         credentials {
-          username project.ossrhUsername
-          password project.ossrhPassword
+          username = project.ossrhUsername
+          password = project.ossrhPassword
         }
       }
     }

sablecc-runtime/build.gradle

@@ -60,11 +60,11 @@ publishing {
     maven {
       final releasesRepoUrl = "https://oss.sonatype.org/service/local/staging/deploy/maven2"
       final snapshotsRepoUrl = "https://oss.sonatype.org/content/repositories/snapshots"
-      url isSnapshot ? snapshotsRepoUrl : releasesRepoUrl
+      url = isSnapshot ? snapshotsRepoUrl : releasesRepoUrl
       if (project.hasProperty('ossrhUsername') && project.hasProperty('ossrhPassword')) {
         credentials {
-          username project.ossrhUsername
-          password project.ossrhPassword
+          username = project.ossrhUsername
+          password = project.ossrhPassword
         }
       }
     }