[lerna] upgrade to a recent version

This helps get rid of some known security vulnerabilities. Also
took care of a `yarn upgrade` warning, saying that devDependency
`vsce` had been renamed to `@vscode/vsce`.

Fixes eclipse-cdt-cloud#178

Signed-off-by: Marc Dumais <marc.dumais@ericsson.com>

lerna.json

@@ -1,6 +1,5 @@
 {
   "version": "independent",
-  "useWorkspaces": true,
   "npmClient": "yarn",
   "command": {
     "run": {

package.json

@@ -18,7 +18,7 @@
   "devDependencies": {
     "copy-webpack-plugin": "^11.0.0",
     "eslint-config-prettier": "^9.0.0",
-    "lerna": "^3.20.2",
+    "lerna": "^7.0.0",
     "prettier": "^3.0.2"
   },
   "workspaces": [

vscode-trace-extension/package.json

@@ -258,7 +258,7 @@
     "terser": "4.8.1",
     "traceviewer-base": "next",
     "traceviewer-react-components": "next",
-    "vsce": "^1.85.1",
+    "@vscode/vsce": "^2.21.0",
     "vscode-trace-common": "0.0.0"
   },
   "devDependencies": {