Update sbt to 1.9.0 (#738)

* Update sbt to 1.9.0

* Run CI on sbt upgrade

---------

Co-authored-by: Taro L. Saito <[email protected]>

Author: scala-steward

.github/workflows/CI.yml

@@ -7,6 +7,7 @@ on:
       - '**.java'
       - '**.sbt'
       - '.github/workflows/**.yml'
+      - 'project/build.properties'
   push:
     branches:
       - master
@@ -17,6 +18,7 @@ on:
       - '**.java'
       - '**.sbt'
       - '.github/workflows/**.yml'
+      - 'project/build.properties'
     workflow_dispatch:
 
 jobs:

project/build.properties

@@ -1,2 +1,2 @@
-sbt.version=1.8.3
+sbt.version=1.9.0