Update CI

Author: penelopeysm

.github/workflows/CI.yml

@@ -6,16 +6,25 @@ on:
       - master
   pull_request:
 
+# needed to allow julia-actions/cache to delete old caches that it has created
+permissions:
+  actions: write
+  contents: read
+
+# Cancel existing tests on the same PR if a new commit is added to a pull request
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref || github.run_id }}
+  cancel-in-progress: ${{ startsWith(github.ref, 'refs/pull/') }}
+
 jobs:
   test:
     runs-on: ${{ matrix.os }}
     continue-on-error: ${{ matrix.version == 'nightly' }}
     strategy:
       matrix:
         version:
-          - '1.6'
+          - 'min'
           - '1'
-          - nightly
         os:
           - ubuntu-latest
           - macOS-latest
@@ -39,25 +48,31 @@ jobs:
             arch: x64
             num_threads: 1
             coverage: true
+
     steps:
-      - uses: actions/checkout@v2
-      - uses: julia-actions/setup-julia@v1
+      - uses: actions/checkout@v4
+
+      - uses: julia-actions/setup-julia@v2
         with:
           version: ${{ matrix.version }}
           arch: ${{ matrix.arch }}
-      - uses: julia-actions/cache@v1
-        with:
-          cache-packages: "false" # caching Conda.jl causes precompilation error
+
+      - uses: julia-actions/cache@v2
+
       - uses: julia-actions/julia-buildpkg@latest
+
       - uses: julia-actions/julia-runtest@latest
         env:
           JULIA_NUM_THREADS: ${{ matrix.num_threads }}
+
       - uses: julia-actions/julia-processcoverage@v1
         if: matrix.coverage
+
       - uses: codecov/codecov-action@v1
         if: matrix.coverage
         with:
           file: lcov.info
+
       - uses: coverallsapp/github-action@master
         if: matrix.coverage
         with: