build(deps): bump actions/setup-go from 6 to 7

Bumps [actions/setup-go](https://github.com/actions/setup-go) from 6 to 7.
- [Release notes](https://github.com/actions/setup-go/releases)
- [Commits](actions/setup-go@v6...v7)

---
updated-dependencies:
- dependency-name: actions/setup-go
  dependency-version: '7'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/nightly.yml

@@ -90,7 +90,7 @@ jobs:
     runs-on: ubuntu-24.04
     name: K3S
     steps:
-    - uses: actions/setup-go@v6
+    - uses: actions/setup-go@v7
       with:
         go-version: '1.25.x'
     - name: Install k3d

.github/workflows/tests.yml

@@ -36,7 +36,7 @@ jobs:
     - uses: actions/checkout@v6
       with:
         fetch-depth: '0'
-    - uses: actions/setup-go@v6
+    - uses: actions/setup-go@v7
       with:
         go-version: '1.26.x'
     - name: golangci-lint
@@ -239,7 +239,7 @@ jobs:
     runs-on: ubuntu-24.04
     name: K3S
     steps:
-    - uses: actions/setup-go@v6
+    - uses: actions/setup-go@v7
       with:
         go-version: '1.26.x'
     - name: Install k3d
@@ -269,7 +269,7 @@ jobs:
     env:
       RESULT_DIR: ${{ github.workspace }}/argo-workflow/
     steps:
-    - uses: actions/setup-go@v6
+    - uses: actions/setup-go@v7
       with:
         go-version: '1.26.x'
     - name: Install k3d
@@ -314,7 +314,7 @@ jobs:
     runs-on: ubuntu-24.04
     timeout-minutes: 10
     steps:
-      - uses: actions/setup-go@v6
+      - uses: actions/setup-go@v7
         with:
           go-version: '1.26.x'
       - uses: actions/checkout@v6