build(deps): bump actions/setup-go from 6.0.0 to 6.1.0

Bumps [actions/setup-go](https://github.com/actions/setup-go) from 6.0.0 to 6.1.0.
- [Release notes](https://github.com/actions/setup-go/releases)
- [Commits](actions/setup-go@4469467...4dc6199)

---
updated-dependencies:
- dependency-name: actions/setup-go
  dependency-version: 6.1.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

.github/workflows/backend.yaml

@@ -16,7 +16,7 @@ jobs:
         with:
           egress-policy: 'audit'
       - name: 'Set up Go'
-        uses: actions/setup-go@44694675825211faa026b3c33043df3e48a5fa00 # v6.0.0
+        uses: actions/setup-go@7a3fe6cf4cb3a834922a1244abfce67bcef6a0c5 # v6.2.0
         with:
           go-version: 1.25
       - name: 'Checkout'
@@ -45,7 +45,7 @@ jobs:
         with:
           egress-policy: 'audit'
       - name: 'Set up Go ${{ matrix.go }}'
-        uses: actions/setup-go@44694675825211faa026b3c33043df3e48a5fa00 # v6.0.0
+        uses: actions/setup-go@7a3fe6cf4cb3a834922a1244abfce67bcef6a0c5 # v6.2.0
         with:
           go-version: ${{ matrix.go }}
       - name: 'Checkout'