chore(deps): bump actions/setup-go from 2 to 6

Bumps [actions/setup-go](https://github.com/actions/setup-go) from 2 to 6.
- [Release notes](https://github.com/actions/setup-go/releases)
- [Commits](https://github.com/actions/setup-go/compare/v2...v6)

---
updated-dependencies:
- dependency-name: actions/setup-go
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

.github/workflows/backend-test-windows.yml

@@ -58,7 +58,7 @@ jobs:
         with:
           deno-version: v2.x
 
-      - uses: actions/setup-go@v2
+      - uses: actions/setup-go@v6
         with:
           go-version: 1.21.5
 

.github/workflows/backend-test.yml

@@ -51,7 +51,7 @@ jobs:
       - uses: denoland/setup-deno@v2
         with:
           deno-version: v2.x
-      - uses: actions/setup-go@v2
+      - uses: actions/setup-go@v6
         with:
           go-version: 1.21.5
       - uses: oven-sh/setup-bun@v2

.github/workflows/go_on_release.yml

@@ -13,7 +13,7 @@ jobs:
     runs-on: ubicloud-standard-8
     steps:
       - uses: actions/checkout@v4
-      - uses: actions/setup-go@v4
+      - uses: actions/setup-go@v6
       - name: install_jq
         run: |
           sudo apt-get update