Bump actions/cache from 3 to 4

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]>

.github/workflows/action.yml

@@ -20,14 +20,14 @@ jobs:
 
     - name: Cache choosenim
       id: cache-choosenim
-      uses: actions/cache@v3
+      uses: actions/cache@v4
       with:
         path: ~/.choosenim
         key: ${{ runner.os }}-choosenim-${{ matrix.nim-version}}
 
     - name: Cache nimble
       id: cache-nimble
-      uses: actions/cache@v3
+      uses: actions/cache@v4
       with:
         path: ~/.nimble
         key: ${{ runner.os }}-nimble-${{ matrix.nim-version}}-${{ hashFiles('prologue.nimble') }}

.github/workflows/docs.yml

@@ -28,7 +28,7 @@ jobs:
         run: echo "::set-output name=dir::$(pip cache dir)"
 
       - name: Cache dependencies
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: ${{ steps.pip-cache.outputs.dir }}
           key: ${{ runner.os }}-pip-${{ hashFiles('**/requirements.txt') }}
@@ -55,14 +55,14 @@ jobs:
 
       - name: Cache choosenim
         id: cache-choosenim
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: ~/.choosenim
           key: ${{ runner.os }}-choosenim-stable
 
       - name: Cache nimble
         id: cache-nimble
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: ~/.nimble
           key: ${{ runner.os }}-nimble-${{ hashFiles('prologue.nimble') }}