Bump julia-actions/cache from 1 to 2 (#855)

Bumps [julia-actions/cache](https://github.com/julia-actions/cache) from 1 to 2.
- [Release notes](https://github.com/julia-actions/cache/releases)
- [Changelog](https://github.com/julia-actions/cache/blob/main/devdocs/making_a_new_release.md)
- [Commits](julia-actions/cache@v1...v2)

---
updated-dependencies:
- dependency-name: julia-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>

Author: dependabot[bot]

.github/workflows/Documenter.yml

@@ -29,7 +29,7 @@ jobs:
       - uses: julia-actions/setup-julia@v1
         with:
           version: '1'
-      - uses: julia-actions/cache@v1
+      - uses: julia-actions/cache@v2
       - name: Install dependencies
         shell: julia --color=yes --project=docs/ {0}
         run: |

.github/workflows/UnitTests.yml

@@ -61,7 +61,7 @@ jobs:
       with:
         arch: ${{ matrix.julia_arch }}
         version: ${{ matrix.julia_version }}
-    - uses: julia-actions/cache@v1
+    - uses: julia-actions/cache@v2
 
     - name: add MPIPreferences
       shell: julia --color=yes --project=. {0}
@@ -113,7 +113,7 @@ jobs:
       with:
         arch: ${{ matrix.julia_arch }}
         version: ${{ matrix.julia_version }}
-    - uses: julia-actions/cache@v1
+    - uses: julia-actions/cache@v2
 
     - name: add MPIPreferences
       shell: julia --color=yes --project=. {0}
@@ -173,7 +173,7 @@ jobs:
         version: ${{ matrix.julia_version }}
         arch: ${{ matrix.julia_arch }}
 
-    - uses: julia-actions/cache@v1
+    - uses: julia-actions/cache@v2
     - name: add MPIPreferences
       shell: julia --color=yes --project=. {0}
       run: |
@@ -228,7 +228,7 @@ jobs:
       with:
         version: ${{ matrix.julia_version }}
 
-    - uses: julia-actions/cache@v1
+    - uses: julia-actions/cache@v2
     - name: add MPIPreferences
       shell: julia --color=yes --project=. {0}
       run: |
@@ -271,7 +271,7 @@ jobs:
       with:
         version: "1"
 
-    - uses: julia-actions/cache@v1
+    - uses: julia-actions/cache@v2
     - name: add MPIPreferences
       shell: julia --color=yes --project=. {0}
       run: |
@@ -314,7 +314,7 @@ jobs:
       with:
         version: ${{ matrix.julia_version }}
 
-    - uses: julia-actions/cache@v1
+    - uses: julia-actions/cache@v2
     - name: add MPIPreferences
       shell: julia --color=yes --project=. {0}
       run: |
@@ -370,7 +370,7 @@ jobs:
       with:
         version: ${{ matrix.julia_version }}
 
-    - uses: julia-actions/cache@v1
+    - uses: julia-actions/cache@v2
 
     - name: add MPIPreferences
       shell: julia --color=yes --project=. {0}
@@ -443,7 +443,7 @@ jobs:
       with:
         version: ${{ matrix.julia_version }}
 
-    - uses: julia-actions/cache@v1
+    - uses: julia-actions/cache@v2
 
     - name: add MPIPreferences
       shell: julia --color=yes --project=. {0}
@@ -510,7 +510,7 @@ jobs:
       with:
         version: ${{ matrix.julia_version }}
 
-    - uses: julia-actions/cache@v1
+    - uses: julia-actions/cache@v2
 
     - name: add MPIPreferences
       shell: julia --color=yes --project=. {0}
@@ -562,7 +562,7 @@ jobs:
       with:
         version: "1"
 
-    - uses: julia-actions/cache@v1
+    - uses: julia-actions/cache@v2
     - name: add MPIPreferences
       shell: julia --color=yes --project=. {0}
       run: |
@@ -611,7 +611,7 @@ jobs:
       with:
         version: "1"
 
-    - uses: julia-actions/cache@v1
+    - uses: julia-actions/cache@v2
     - name: add MPIPreferences
       shell: julia --color=yes --project=. {0}
       run: |