Bump actions/cache from v2 to v2.1.4

Bumps [actions/cache](https://github.com/actions/cache) from v2 to v2.1.4.
- [Release notes](https://github.com/actions/cache/releases)
- [Commits](actions/cache@v2...26968a0)

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/release.yml

@@ -14,7 +14,7 @@ jobs:
       - uses: dawidd6/action-get-tag@v1
         id: get-tag
       - uses: actions/checkout@v2
-      - uses: actions/cache@v2
+      - uses: actions/cache@v2.1.4
         with:
           path: .build
           key: ${{runner.os}}-${{github.repository}}-spm-${{hashFiles('**/Package.resolved')}}

.github/workflows/swift-test.yml

@@ -12,7 +12,7 @@ jobs:
     steps:
       - run: sudo xcode-select -s /Applications/Xcode_12.3.app/Contents/Developer
       - uses: actions/checkout@v2
-      - uses: actions/cache@v2
+      - uses: actions/cache@v2.1.4
         with:
           path: .build
           key: ${{runner.os}}-${{github.repository}}-spm-${{hashFiles('**/Package.resolved')}}
@@ -40,7 +40,7 @@ jobs:
           release-version: 5.3.2
           platform: ${{matrix.os}}
       - uses: actions/checkout@v2
-      - uses: actions/cache@v2
+      - uses: actions/cache@v2.1.4
         with:
           path: .build
           key: ${{runner.os}}-${{github.repository}}-spm-${{hashFiles('**/Package.resolved')}}