gitpod: don't lock extensions' version (#915)

Co-authored-by: David Leal <[email protected]>

Author: imba-tjd

.gitpod.yml

@@ -11,7 +11,7 @@ github:
 
 vscode:
   extensions:
-    - ms-vscode.cpptools@0.28.3:mjRj37VUK0nY2ZeDXzxOJA==
-    - twxs.cmake@0.0.17:9s7m9CWOr6i6NZ7CNNF4kw==
-    - ms-vscode.cmake-tools@1.4.0:eP3hU/MFme+CcSL21Klk1w==
-    - mhutchie.git-graph@1.23.0:TM9ShNmBn94aUJMJusCJlg==
+    - ms-vscode.cpptools
+    - twxs.cmake
+    - ms-vscode.cmake-tools
+    - mhutchie.git-graph