Bump actions/cache from 4 to 5 in the all-actions group

Bumps the all-actions group with 1 update: [actions/cache](https://github.com/actions/cache).


Updates `actions/cache` from 4 to 5
- [Release notes](https://github.com/actions/cache/releases)
- [Changelog](https://github.com/actions/cache/blob/main/RELEASES.md)
- [Commits](actions/cache@v4...v5)

---
updated-dependencies:
- dependency-name: actions/cache
  dependency-version: '5'
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: all-actions
...

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

Author: dependabot[bot]

.github/workflows/conda.yaml

@@ -29,7 +29,7 @@ jobs:
 
     steps:
     - name: Cache Anaconda installer, conda packages
-      uses: actions/cache@v4
+      uses: actions/cache@v5
       with:
         path: |
           $CONDA/pkgs
@@ -61,7 +61,7 @@ jobs:
       shell: python
 
     - name: Cache GAMS installer
-      uses: actions/cache@v4
+      uses: actions/cache@v5
       with:
         path: |
           gams

.github/workflows/nightly.yaml

@@ -49,7 +49,7 @@ jobs:
         python-version: ${{ matrix.python-version }}
 
     - name: Cache GAMS installer and snapshot files
-      uses: actions/cache@v4
+      uses: actions/cache@v5
       with:
         path: |
           gams

.github/workflows/pytest.yaml

@@ -109,7 +109,7 @@ jobs:
         java-version: '21'
 
     - name: Cache GAMS installer
-      uses: actions/cache@v4
+      uses: actions/cache@v5
       with:
         path: |
           gams
@@ -187,7 +187,7 @@ jobs:
         windows-path-include-rtools: false
 
     - name: Cache GAMS installer and R packages
-      uses: actions/cache@v4
+      uses: actions/cache@v5
       with:
         path: |
           gams