Prepare for release 3.12.0.

Author: squarejesse

CHANGELOG.md

@@ -1,6 +1,15 @@
 Change Log
 ==========
 
+## Version 3.12.0
+
+_2025-05-27_
+
+ * New: Support an optional end index when searching with `BufferedSource.indexOf()`.
+ * Fix: Don't do unnecessary work in `BufferedSource.rangeEquals()`.
+ * Upgrade: [Kotlin 2.1.21][kotlin_2_1_21].
+
+
 ## Version 3.11.0
 
 _2025-04-09_
@@ -962,6 +971,7 @@ _2014-04-08_
 [kotlin_1_9_10]: https://github.com/JetBrains/kotlin/releases/tag/v1.9.10
 [kotlin_1_9_21]: https://github.com/JetBrains/kotlin/releases/tag/v1.9.21
 [kotlin_2_1_20]: https://github.com/JetBrains/kotlin/releases/tag/v2.1.20
+[kotlin_2_1_21]: https://github.com/JetBrains/kotlin/releases/tag/v2.1.21
 [loom]: https://wiki.openjdk.org/display/loom/Getting+started
 [maven_provided]: https://maven.apache.org/guides/introduction/introduction-to-dependency-mechanism.html
 [preview1]: https://github.com/WebAssembly/WASI/blob/main/legacy/preview1/docs.md

docs/index.md

@@ -98,7 +98,7 @@ Releases
 Our [change log][changelog] has release history.
 
 ```kotlin
-implementation("com.squareup.okio:okio:3.11.0")
+implementation("com.squareup.okio:okio:3.12.0")
 ```
 
 <details>
@@ -110,7 +110,7 @@ repositories {
 }
 
 dependencies {
-  implementation("com.squareup.okio:okio:3.11.0")
+  implementation("com.squareup.okio:okio:3.12.0")
 }
 ```
 

gradle.properties

@@ -12,4 +12,4 @@ kotlin.mpp.commonizerLogLevel=info
 kotlin.mpp.stability.nowarn=true
 
 GROUP=com.squareup.okio
-VERSION_NAME=3.12.0-SNAPSHOT
+VERSION_NAME=3.12.0