Update actions/cache requirement to v2.1.4 (#1709)

Updates the requirements on [actions/cache](https://github.com/actions/cache) to permit the latest version.
- [Release notes](https://github.com/actions/cache/releases)
- [Commits](https://github.com/actions/cache/commits/26968a09c0ea4f3e233fdddbafd1166051a095f6)

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/main-build.yml

@@ -21,13 +21,13 @@ jobs:
           echo ::set-output name=build_cache::$(go env GOCACHE)
 
       - name: Go modules cache
-        uses: actions/cache@v2
+        uses: actions/cache@v2.1.4
         with:
           path: ${{ steps.go-paths.outputs.mod_cache }}
           key: ${{ runner.os }}-go-mod-${{ hashFiles('**/go.sum') }}
 
       - name: Go build cache
-        uses: actions/cache@v2
+        uses: actions/cache@v2.1.4
         with:
           path: ${{ steps.go-paths.outputs.build_cache }}
           key: ${{ runner.os }}-go-build-cache-${{ hashFiles('**/go.sum') }}

.github/workflows/pr-validation.yml

@@ -21,13 +21,13 @@ jobs:
           echo ::set-output name=build_cache::$(go env GOCACHE)
 
       - name: Go modules cache
-        uses: actions/cache@v2
+        uses: actions/cache@v2.1.4
         with:
           path: ${{ steps.go-paths.outputs.mod_cache }}
           key: ${{ runner.os }}-go-mod-${{ hashFiles('**/go.sum') }}
 
       - name: Go build cache
-        uses: actions/cache@v2
+        uses: actions/cache@v2.1.4
         with:
           path: ${{ steps.go-paths.outputs.build_cache }}
           key: ${{ runner.os }}-go-build-cache-${{ hashFiles('**/go.sum') }}

.github/workflows/release-build.yml

@@ -21,13 +21,13 @@ jobs:
           echo ::set-output name=build_cache::$(go env GOCACHE)
 
       - name: Go modules cache
-        uses: actions/cache@v2
+        uses: actions/cache@v2.1.4
         with:
           path: ${{ steps.go-paths.outputs.mod_cache }}
           key: ${{ runner.os }}-go-mod-${{ hashFiles('**/go.sum') }}
 
       - name: Go build cache
-        uses: actions/cache@v2
+        uses: actions/cache@v2.1.4
         with:
           path: ${{ steps.go-paths.outputs.build_cache }}
           key: ${{ runner.os }}-go-build-cache-${{ hashFiles('**/go.sum') }}