build: update build-time dependencies, address new warnings (#413)

* build: update build-time dependencies, address new warnings

* build: switch to central repo declaration, remove redundant repositories

* build: use spotless predeclaration, more task avoidance on kotlin modules

cloud-annotations/build.gradle.kts

@@ -1,3 +1,5 @@
+import net.ltgt.gradle.errorprone.errorprone
+
 plugins {
     id("cloud.base-conventions")
     id("com.palantir.revapi")
@@ -8,3 +10,9 @@ dependencies {
 
     testImplementation(libs.compileTesting)
 }
+
+tasks.withType(JavaCompile::class).configureEach {
+    options.errorprone {
+        disable("UnusedMethod") // false positives from command annotations
+    }
+}