Bump actions/cache from 3 to 4 (unionai-oss#1478)

Bumps [actions/cache](https://github.com/actions/cache) from 3 to 4.
- [Release notes](https://github.com/actions/cache/releases)
- [Changelog](https://github.com/actions/cache/blob/main/RELEASES.md)
- [Commits](actions/cache@v3...v4)

---
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-tests.yml

@@ -43,7 +43,7 @@ jobs:
         uses: actions/setup-python@v4
         with:
           python-version: ${{ matrix.python-version }}
-      - uses: actions/cache@v3
+      - uses: actions/cache@v4
         with:
           path: ~/.cache/pip  # ubuntu location
           key: ${{ runner.os }}-pip-${{ hashFiles('requirements-dev.txt') }}
@@ -120,7 +120,7 @@ jobs:
           python-version: ${{ matrix.python-version }}
 
       - name: Cache conda
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         env:
           # Increase this value to reset cache if etc/environment.yml has not changed
           CACHE_NUMBER: 2
@@ -130,7 +130,7 @@ jobs:
         id: cache
 
       - name: Cache pip
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: ${{ matrix.pip-cache }}
           key: ${{ runner.os }}-pip-${{ hashFiles('requirements-dev.txt') }}