Remove Incubating annotations on dependency notations

They are not needed since we have a mechanism that lets us
remove them without breaking the builds.

Also updated the snippet in the docs.

Author: LouisCAD

docs/contributing/submitting-prs/dependency-notations-updates.md

@@ -10,7 +10,6 @@ Here is what a dependency notation should look like:
 @file:Suppress("PackageDirectoryMismatch", "SpellCheckingInspection", "unused") // 1
 
 import de.fayard.refreshVersions.core.DependencyGroup
-import org.gradle.api.Incubating
 import org.gradle.kotlin.dsl.IsNotADependency
 
 /**                                                             // 2
@@ -20,7 +19,6 @@ import org.gradle.kotlin.dsl.IsNotADependency
  * - GitHub page: [Kodein-Framework/Kodein-DI](https://github.com/Kodein-Framework/Kodein-DI)
  * - [GitHub Releases here](https://github.com/Kodein-Framework/Kodein-DI/releases)
  */
-@Incubating
 object Kodein : IsNotADependency {                              // 3
 
     val di = DI                                                 // 4

plugins/dependencies/src/main/kotlin/dependencies/JetBrains.kt

@@ -1,10 +1,8 @@
 @file:Suppress("PackageDirectoryMismatch", "SpellCheckingInspection", "unused")
 
 import de.fayard.refreshVersions.core.DependencyGroup
-import org.gradle.api.Incubating
 import org.gradle.kotlin.dsl.IsNotADependency
 
-@Incubating
 object JetBrains : IsNotADependency {
 
     /**

plugins/dependencies/src/main/kotlin/dependencies/RickClephas.kt

@@ -1,7 +1,6 @@
 @file:Suppress("PackageDirectoryMismatch", "SpellCheckingInspection", "unused")
 
 import de.fayard.refreshVersions.core.DependencyGroup
-import org.gradle.api.Incubating
 import org.gradle.kotlin.dsl.IsNotADependency
 
 /**
@@ -10,7 +9,6 @@ import org.gradle.kotlin.dsl.IsNotADependency
  * - GitHub page: [NativeCoroutines](https://github.com/rickclephas/KMP-NativeCoroutines)
  * - [GitHub Releases here](https://github.com/rickclephas/KMP-NativeCoroutines/releases)
  */
-@Incubating
 object RickClephas : IsNotADependency {
 
     val nativeCoroutines = NativeCoroutines