ci: bump actions/cache from 4.0.1 to 4.0.2

Bumps [actions/cache](https://github.com/actions/cache) from 4.0.1 to 4.0.2.
- [Release notes](https://github.com/actions/cache/releases)
- [Changelog](https://github.com/actions/cache/blob/main/RELEASES.md)
- [Commits](actions/cache@v4.0.1...v4.0.2)

---
updated-dependencies:
- dependency-name: actions/cache
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

.github/workflows/inspektor-gadget.yml

@@ -260,7 +260,7 @@ jobs:
       shell: bash
     - name: Cache BTFGen
       id: cache-btfgen
-      uses: actions/cache@v4.0.1
+      uses: actions/cache@v4.0.2
       with:
         path: pkg/btfgen/btfs
         # key is composed by
@@ -304,7 +304,7 @@ jobs:
       shell: bash
     - name: Cache BTFGen
       id: cache-btfgen
-      uses: actions/cache@v4.0.1
+      uses: actions/cache@v4.0.2
       with:
         path: pkg/btfgen/btfs
         # key is composed by
@@ -422,7 +422,7 @@ jobs:
       id: buildx
       uses: docker/setup-buildx-action@v3
     - name: Cache Docker layers
-      uses: actions/cache@v4.0.1
+      uses: actions/cache@v4.0.2
       with:
         path: /tmp/.buildx-cache
         key: ${{ runner.os }}-docker-${{ matrix.platform }}-${{ hashFiles('Dockerfiles/gadget.Dockerfile') }}
@@ -447,7 +447,7 @@ jobs:
       shell: bash
     - name: Cache BTFGen
       id: cache-btfgen
-      uses: actions/cache@v4.0.1
+      uses: actions/cache@v4.0.2
       with:
         path: pkg/btfgen/btfs
         # key is composed by
@@ -547,7 +547,7 @@ jobs:
       id: buildx
       uses: docker/setup-buildx-action@v3
     - name: Cache Docker layers
-      uses: actions/cache@v4.0.1
+      uses: actions/cache@v4.0.2
       with:
         path: /tmp/.buildx-cache
         key: ${{ runner.os }}-docker-${{ matrix.platform }}-${{ hashFiles('Dockerfiles/ig.Dockerfile') }}
@@ -572,7 +572,7 @@ jobs:
       shell: bash
     - name: Cache BTFGen
       id: cache-btfgen
-      uses: actions/cache@v4.0.1
+      uses: actions/cache@v4.0.2
       with:
         path: pkg/btfgen/btfs
         # key is composed by