fix: refresh lockfile after version packages (#555)

## Summary
- refresh `yarn.lock` after the merged `Version Packages` PR bumped
`@reflag/node-sdk`
- make `yarn version-packages` run `yarn install` after `changeset
version`

## Why
The merged Version Packages PR updated package versions but did not
update `yarn.lock`, which caused the `Release packages` workflow on
`main` to fail at `yarn install --immutable` before `changesets/action`
could proceed.

## Verification
- `bash -ic 'yarn install --immutable'`

Author: roncohen

package.json

@@ -21,7 +21,7 @@
     "prettier:fix": "lerna run prettier -- --write",
     "lint": "lerna run lint --stream",
     "lint:ci": "lerna run lint:ci --stream",
-    "version-packages": "changeset version",
+    "version-packages": "changeset version && yarn install",
     "release": "changeset publish",
     "docs": "./docs.sh"
   },

yarn.lock

@@ -6039,7 +6039,7 @@ __metadata:
   languageName: unknown
   linkType: soft
 
-"@reflag/node-sdk@npm:1.2.0, @reflag/node-sdk@workspace:^, @reflag/node-sdk@workspace:packages/node-sdk":
+"@reflag/node-sdk@npm:1.3.0, @reflag/node-sdk@workspace:^, @reflag/node-sdk@workspace:packages/node-sdk":
   version: 0.0.0-use.local
   resolution: "@reflag/node-sdk@workspace:packages/node-sdk"
   dependencies:
@@ -6091,7 +6091,7 @@ __metadata:
     "@openfeature/core": "npm:^1.5.0"
     "@openfeature/server-sdk": "npm:>=1.16.1"
     "@reflag/eslint-config": "npm:~0.0.2"
-    "@reflag/node-sdk": "npm:1.2.0"
+    "@reflag/node-sdk": "npm:1.3.0"
     "@reflag/tsconfig": "npm:~0.0.2"
     "@types/node": "npm:^22.12.0"
     eslint: "npm:^9.21.0"