Add Minecraft 26.1.1 target while keeping 26.1 build support

[Pankraz01]

Motivation

• Bump the active Stonecutter Minecraft target to 26.1.1 to publish a build for the new patch while preserving existing 26.1 artifacts when no code changes are required.

Description

• Switched active Stonecutter target from 26.1 to 26.1.1 in stonecutter.gradle.kts.
• Added 26.1.1 to the Stonecutter version matrix and set vcsVersion = "26.1.1" in settings.gradle.kts so both 26.1 and 26.1.1 builds are available.
• Added versions/26.1.1/gradle.properties profile with Minecraft metadata for 26.1.1 and left Fabric API coordinates unchanged where compatible.
• Updated README.md supported-versions line and added a 2.2.2 entry to CHANGELOG.md documenting the new active target.

Testing

• Attempted to list Gradle tasks with ./gradlew tasks --all to validate the build setup, but plugin resolution for net.fabricmc.fabric-loom:1.15.5 failed in this environment and the command aborted before project evaluation.
• No automated unit tests were run because the Gradle invocation could not complete due to the plugin resolution failure.

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Codex Task