Bump actions/cache from 4 to 5 (#4219)

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

Author: dependabot[bot]

.github/workflows/buf-binary-size.yaml

@@ -22,7 +22,7 @@ jobs:
           go-version: "1.25.x"
           check-latest: true
       - name: cache
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         with:
           path: |
             ~/.cache/buf/${{ runner.os }}/x86_64/bin

.github/workflows/ci.yaml

@@ -22,7 +22,7 @@ jobs:
           go-version: "1.25.x"
           check-latest: true
       - name: cache
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         with:
           path: |
             ~/.cache/buf/${{ runner.os }}/x86_64/bin
@@ -34,7 +34,7 @@ jobs:
           restore-keys: |
             ${{ runner.os }}-buf-lint-
       - name: golangci-lint-cache
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         with:
           path: ~/.cache/golangci-lint
           # https://github.com/golangci/golangci-lint-action#caching-internals includes an interval number in the cache
@@ -59,7 +59,7 @@ jobs:
           go-version: "1.25.x"
           check-latest: true
       - name: cache
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         with:
           path: |
             ~/.cache/buf/${{ runner.os }}/x86_64/bin

.github/workflows/previous.yaml

@@ -25,7 +25,7 @@ jobs:
           go-version: ${{ matrix.go-version }}
           check-latest: true
       - name: cache
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         with:
           path: |
             ~/.cache/buf/${{ runner.os }}/x86_64/bin

.github/workflows/windows.yaml

@@ -30,7 +30,7 @@ jobs:
           check-latest: true
           cache: true
       - name: windows-cache
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         with:
           path: |
             ${{ env.DOWNLOAD_CACHE }}