Don't allow major updates of vsce (#1172)

Major update breaks dependabot because require going to node.js 20.
Will leave until a later time when we can properly migrate to the next
major version of node.js and vsce

#1171

Issue: #1136

Author: award999

.github/dependabot.yml

@@ -18,6 +18,8 @@ updates:
         update-types: ["version-update:semver-major"]
       - dependency-name: "*chai*"
         update-types: ["version-update:semver-major"]
+      - dependency-name: "@vscode/vsce"
+        update-types: ["version-update:semver-major"]
       - dependency-name: "@types/vscode"
     groups:
       all-dependencies: