Bump Julia 1.9 version.

Author: maleadt

.github/workflows/ci.yml

@@ -13,7 +13,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        version: ['1.6', '1.7', '1.8', '^1.9.0-beta3']
+        version: ['1.6', '1.7', '1.8', '^1.9.0-rc1']
         os: [ubuntu-latest, macOS-latest, windows-latest]
         arch: [x64]
     steps: