chore(ci): bump actions/checkout from 4 to 6

Bumps [actions/checkout](https://github.com/actions/checkout) from 4 to 6.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v4...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>

Author: dependabot[bot]

.github/workflows/canary.yml

@@ -28,7 +28,7 @@ jobs:
         working-directory: mcp-server
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Setup node.js
         uses: actions/setup-node@v4

.github/workflows/dev.yml

@@ -29,7 +29,7 @@ jobs:
         working-directory: mcp-server
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Setup node.js
         uses: actions/setup-node@v4
@@ -58,7 +58,7 @@ jobs:
         working-directory: mcp-server
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Setup node.js
         uses: actions/setup-node@v4
@@ -82,7 +82,7 @@ jobs:
         working-directory: mcp-server
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Setup node.js
         uses: actions/setup-node@v4
@@ -106,7 +106,7 @@ jobs:
         working-directory: mcp-server
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Setup node.js
         uses: actions/setup-node@v4
@@ -130,7 +130,7 @@ jobs:
         working-directory: mcp-server
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Setup node.js
         uses: actions/setup-node@v4
@@ -154,7 +154,7 @@ jobs:
         working-directory: mcp-server
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Setup node.js
         uses: actions/setup-node@v4
@@ -178,7 +178,7 @@ jobs:
         working-directory: mcp-server
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Setup node.js
         uses: actions/setup-node@v4
@@ -203,7 +203,7 @@ jobs:
         working-directory: mcp-server
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Setup node.js
         uses: actions/setup-node@v4

.github/workflows/release.yml

@@ -16,7 +16,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Setup node.js
         uses: actions/setup-node@v4