some CI updates (#193)

* Update ci.yml

* Update ci.yml

* Update pipeline.yml

Author: mcabbott

.buildkite/pipeline.yml

@@ -3,10 +3,10 @@ env:
   # SECRET_CODECOV_TOKEN: "..."
 
 steps:
-  - label: "Julia 1.8"
+  - label: "Julia 1.11"
     plugins:
       - JuliaCI/julia#v0.5:
-          version: "1.8"
+          version: "1.11"
       - JuliaCI/julia-test#v0.3: ~
       # - JuliaCI/julia-coverage#v0.3:
       #     codecov: true

.github/workflows/ci.yml

@@ -30,12 +30,12 @@ jobs:
           - '1' # automatically expands to the latest stable 1.x release of Julia
           # - 'nightly'
     steps:
-      - uses: actions/checkout@v2
-      - uses: julia-actions/setup-julia@v1
+      - uses: actions/checkout@v5
+      - uses: julia-actions/setup-julia@v2
         with:
           version: ${{ matrix.version }}
           arch: ${{ matrix.arch }}
-      - uses: actions/cache@v1
+      - uses: actions/cache@v4
         env:
           cache-name: cache-artifacts
         with: