Bump actions/setup-node from v2.1.4 to v2.1.5 (Mudlet#4880)

Bumps [actions/setup-node](https://github.com/actions/setup-node) from v2.1.4 to v2.1.5.
- [Release notes](https://github.com/actions/setup-node/releases)
- [Commits](actions/setup-node@v2.1.4...46071b5)

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/link-ptbs-to-dblsqd.yml

@@ -15,7 +15,7 @@ jobs:
     - uses: leafo/gh-actions-lua@v8
       with:
         luaVersion: "5.1.5"
-    - uses: actions/setup-node@v2.1.4
+    - uses: actions/setup-node@v2.1.5
     - uses: leafo/gh-actions-luarocks@v4
 
     - name: Retrieve latest PTB version

.github/workflows/update-autocompletion.yml

@@ -15,7 +15,7 @@ jobs:
     - uses: leafo/gh-actions-lua@v8
       with:
         luaVersion: "5.1.5"
-    - uses: actions/setup-node@v2.1.4
+    - uses: actions/setup-node@v2.1.5
     - uses: leafo/gh-actions-luarocks@v4
 
     - name: install Lua dependencies