Update IBT version to 1.12.0-alpha

Dandielo · Dandielo · commit 932272266afe · 2026-01-16T00:02:23.000+09:00
diff --git a/tools/conanfile.txt b/tools/conanfile.txt
@@ -1,6 +1,6 @@
 [requires]
 fastbuild-installer/1.12@iceshard/stable
-ice-build-tools/1.11.1@iceshard/stable
+ice-build-tools/1.12.0-alpha@iceshard/stable
 
 [generators]
 VirtualRunEnv
