only v1 CI

Author: ChrisRackauckas

.github/workflows/CI.yml

@@ -22,7 +22,6 @@ jobs:
           - Downstream2
         version:
           - '1'
-          - '1.6'
     steps:
       - uses: actions/checkout@v4
       - uses: julia-actions/setup-julia@v1

.github/workflows/Downstream.yml

@@ -18,7 +18,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        julia-version: [1,1.6]
+        julia-version: [1]
         os: [ubuntu-latest]
         package:
           - {user: SciML, repo: DelayDiffEq.jl, group: Interface}