Update tasks.json

Addressed review comment

.vscode/tasks.json

@@ -4,7 +4,7 @@
     {
       "label": "Install requirements",
       "type": "shell",
-      "command": "pip3 install -r requirements.txt;pip3 install -r requirements-dev.txt",
+      "command": "pip3 install -r requirements-dev.txt",
       "problemMatcher": []
     },
     {