bumped integration tests

Author: mxpoch

.github/workflows/Downstream.yml

@@ -14,7 +14,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        julia-version: [1,1.6]
+        julia-version: ['lts', '1', 'pre']
         os: [ubuntu-latest]
         package:
           - {user: JuliaSIMD, repo: LoopVectorization.jl, group: Interface}