build(deps): bump actions/checkout from 5 to 6 (#230)

Bumps [actions/checkout](https://github.com/actions/checkout) from 5 to 6.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v5...v6)

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

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/ci.yaml

@@ -33,7 +33,7 @@ jobs:
       toolchain: ${{steps.set_toolchain.outputs.toolchain}}
       nightly_toolchain: ${{steps.set_toolchain.outputs.nightly_toolchain}}
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Set toolchain
         id: set_toolchain
         run: |
@@ -52,7 +52,7 @@ jobs:
     runs-on: ubuntu-latest
     needs: toolchain
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Install Rust
         uses: dtolnay/rust-toolchain@master
@@ -80,7 +80,7 @@ jobs:
     runs-on: ubuntu-latest
     needs: toolchain
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Install Rust
         uses: dtolnay/rust-toolchain@master
@@ -104,7 +104,7 @@ jobs:
     runs-on: ubuntu-latest
     needs: [toolchain, check, fmt-check]
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Install Rust
         uses: dtolnay/rust-toolchain@master
@@ -133,7 +133,7 @@ jobs:
     runs-on: ubuntu-latest
     needs: [toolchain, check, fmt-check]
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Install Rust
         uses: dtolnay/rust-toolchain@master

.github/workflows/release-backend.yml

@@ -18,7 +18,7 @@ jobs:
       toolchain: ${{steps.set_toolchain.outputs.toolchain}}
       nightly_toolchain: ${{steps.set_toolchain.outputs.nightly_toolchain}}
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Set toolchain
         id: set_toolchain
         run: |

.github/workflows/release-gateway.yml

@@ -18,7 +18,7 @@ jobs:
       toolchain: ${{steps.set_toolchain.outputs.toolchain}}
       nightly_toolchain: ${{steps.set_toolchain.outputs.nightly_toolchain}}
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Set toolchain
         id: set_toolchain
         run: |