Bump actions/setup-node from 5 to 6

Bumps [actions/setup-node](https://github.com/actions/setup-node) from 5 to 6.
- [Release notes](https://github.com/actions/setup-node/releases)
- [Commits](actions/setup-node@v5...v6)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/echidna.yml

@@ -145,7 +145,7 @@ jobs:
           persist-credentials: false
 
       - name: Set up Nodejs
-        uses: actions/setup-node@v5
+        uses: actions/setup-node@v6
         if: startsWith(matrix.workdir, 'dvdefi')
         with:
           node-version: 16

.github/workflows/lint_format.yml

@@ -21,7 +21,7 @@ jobs:
           persist-credentials: false
 
       - name: Set up Node.js
-        uses: actions/setup-node@v5
+        uses: actions/setup-node@v6
         with:
           node-version: 16
 

.github/workflows/medusa.yml

@@ -141,7 +141,7 @@ jobs:
           persist-credentials: false
 
       - name: Set up Nodejs
-        uses: actions/setup-node@v5
+        uses: actions/setup-node@v6
         if: startsWith(matrix.workdir, 'dvdefi')
         with:
           node-version: 16