Update build scripts to avoid deprecation warnings with Gradle 8

Closes gh-28

build.gradle

@@ -4,7 +4,9 @@ buildscript {
         mavenCentral()
         gradlePluginPortal()
         if (projectVersion.endsWith("SNAPSHOT")) {
-            maven { url "https://s01.oss.sonatype.org/content/repositories/snapshots/" }
+            maven {
+                url = "https://s01.oss.sonatype.org/content/repositories/snapshots/"
+            }
         }
     }
     dependencies {
@@ -18,8 +20,8 @@ ext."signing.password" = project.hasProperty("signing.password") ? project.getPr
 ext."signing.secretKeyRingFile" = project.hasProperty("signing.secretKeyRingFile") ? project.getProperty('signing.secretKeyRingFile') : ("${System.properties['user.home']}${File.separator}.gnupg${File.separator}secring.gpg")
 ext.isReleaseVersion = !projectVersion.endsWith("SNAPSHOT")
 
-version projectVersion
-group "org.graceframework.profiles"
+version = projectVersion
+group = "org.graceframework.profiles"
 
 apply plugin: "eclipse"
 apply plugin: "idea"
@@ -33,7 +35,9 @@ repositories {
     // mavenLocal()
     mavenCentral()
     if (!isReleaseVersion) {
-        maven { url "https://s01.oss.sonatype.org/content/repositories/snapshots/" }
+        maven {
+            url = "https://s01.oss.sonatype.org/content/repositories/snapshots/"
+        }
     }
 }
 
@@ -127,7 +131,7 @@ nexusPublishing {
 
 afterEvaluate {
     signing {
-        required { isReleaseVersion && gradle.taskGraph.hasTask("publish") }
+        required = isReleaseVersion && gradle.taskGraph.hasTask("publish")
         sign publishing.publications.maven
     }
 }