use correct lerna workspace setup

- `lerna bootstrap` is to be deprecated. The `yarn workspace` should be used instead: https://lerna.js.org/docs/getting-started#package-dependency-management
- `"@k8slens/semver": "./packages/semver"` syntax is not universally supported. (In fact, it's not supported by [flatpak_node_generator](https://github.com/flatpak/flatpak-builder-tools/tree/master/node) that I use to [publish this application to flathub.org](https://github.com/flathub/flathub/pull/3811). Of course, it would be [more standard-compliant](https://yarnpkg.com/features/workspaces#workspace-ranges-workspace) to use `workspace:` when you upgrade to yarn 2.

Signed-off-by: proletarius101 <proletarius101@protonmail.com>

lerna.json

@@ -1,6 +1,6 @@
 {
   "$schema": "node_modules/lerna/schemas/lerna-schema.json",
-  "useWorkspaces": false,
+  "useWorkspaces": true,
   "packages": [
     "packages/*"
   ],

package.json

@@ -1,6 +1,9 @@
 {
   "name": "lens-monorepo",
   "private": true,
+  "workspaces": [
+    "packages/*"
+  ],
   "scripts": {
     "adr:create": "echo \"What is the title?\"; read title; adr new \"$title\"",
     "adr:change-status": "echo \"Decision number?:\"; read decision; adr status $decision",
@@ -18,12 +21,11 @@
     "test:unit": "lerna run --stream test:unit",
     "test:integration": "lerna run --stream test:integration",
     "bump-version": "lerna version --no-git-tag-version --no-push",
-    "create-release-pr": "create-release-pr",
-    "postinstall": "lerna bootstrap --ignore open-lens && lerna bootstrap --scope open-lens --include-dependencies"
+    "create-release-pr": "create-release-pr"
   },
   "devDependencies": {
-    "@k8slens/semver": "./packages/semver",
-    "@k8slens/release-tool": "./packages/release-tool",
+    "@k8slens/semver": "^6.4.0-beta.13",
+    "@k8slens/release-tool": "^6.4.0-beta.13",
     "adr": "^1.4.3",
     "cross-env": "^7.0.3",
     "lerna": "^6.4.1",