Bump actions/cache from 2.1.7 to 3 (#84)

Bumps [actions/cache](https://github.com/actions/cache) from 2.1.7 to 3.
- [Release notes](https://github.com/actions/cache/releases)
- [Commits](actions/cache@v2.1.7...v3)

---
updated-dependencies:
- dependency-name: actions/cache
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/ci.yaml

@@ -31,7 +31,7 @@ jobs:
           access_token: ${{ github.token }}
       - uses: actions/checkout@v3
       - name: Cache conda
-        uses: actions/cache@v2.1.7
+        uses: actions/cache@v3
         env:
           # Increase this value to reset cache if ci/environment.yml has not changed
           CACHE_NUMBER: 0
@@ -77,7 +77,7 @@ jobs:
     steps:
       - uses: actions/checkout@v3
       - name: Cache conda
-        uses: actions/cache@v2.1.7
+        uses: actions/cache@v3
         env:
           # Increase this value to reset cache if ci/environment.yml has not changed
           CACHE_NUMBER: 0