chore(ci): remove node v15 checks

Author: borjapazr

.github/workflows/ci.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        node-version: [14.x, 15.x, 16.x]
+        node-version: [14.x, 16.x]
 
     steps:
       - name: ⬇️ Checkout project
@@ -45,7 +45,7 @@ jobs:
     needs: validate
     strategy:
       matrix:
-        node-version: [14.x, 15.x, 16.x]
+        node-version: [14.x, 16.x]
 
     steps:
       - name: ⬇️ Checkout project
@@ -69,7 +69,7 @@ jobs:
     needs: test
     strategy:
       matrix:
-        node-version: [14.x, 15.x, 16.x]
+        node-version: [14.x, 16.x]
 
     steps:
       - name: ⬇️ Checkout project