update CI a bit

.github/workflows/ci.yml

@@ -1,9 +1,10 @@
 name: CI
+
 on:
   push:
     branches:
       - master
-      - develop
+  pull_request:
 
 jobs:
   test:
@@ -13,8 +14,8 @@ jobs:
       fail-fast: false
       matrix:
         version:
-          - '1.6' # Oldest supported version for COBREXA.jl
           - '1' # This is always the latest stable release in the 1.X series
+          - '1.6' # LTS
           #- 'nightly'
         os:
           - ubuntu-latest
@@ -23,28 +24,20 @@ jobs:
         arch:
           - x64
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: julia-actions/setup-julia@v1
         with:
           version: ${{ matrix.version }}
           arch: ${{ matrix.arch }}
-      - uses: actions/cache@v1
-        env:
-          cache-name: cache-artifacts
-        with:
-          path: ~/.julia/artifacts
-          key: ${{ runner.os }}-test-${{ env.cache-name }}-${{ hashFiles('**/Project.toml') }}
-          restore-keys: |
-            ${{ runner.os }}-test-${{ env.cache-name }}-
-            ${{ runner.os }}-test-
-            ${{ runner.os }}-
+      - uses: julia-actions/cache@v1
       - uses: julia-actions/julia-buildpkg@latest
       - run: |
           git config --global user.name Tester
           git config --global user.email [email protected]
       - uses: julia-actions/julia-runtest@latest
         continue-on-error: ${{ matrix.version == 'nightly' }}
       - uses: julia-actions/julia-processcoverage@v1
-      - uses: codecov/codecov-action@v1
+      - uses: codecov/codecov-action@v4
         with:
-          file: lcov.info
+          files: lcov.info
+          token: ${{ secrets.CODECOV_TOKEN }}