configure more gh actions for node LTS (#3613)

* finish upgrading to node 18

* fix: node version

.github/workflows/main-test.yml

@@ -13,7 +13,6 @@ jobs:
         uses: actions/checkout@v3
       - uses: actions/setup-node@v3
         with:
-          node-version: 16
           cache: yarn
       - name: Cache node modules
         id: cache-modules
@@ -36,8 +35,7 @@ jobs:
     steps:
       - uses: actions/checkout@v3
       - uses: actions/setup-node@v3
-        with:
-          node-version: 16
+
       - id: cache-modules
         uses: actions/cache@v3
         with:

.github/workflows/pr-graphql-compat-check.yml

@@ -31,7 +31,6 @@ jobs:
       - uses: actions/setup-node@v3
         with:
           cache: yarn
-          node-version: 16
       - name: Cache node modules
         uses: actions/cache@v3
         with:

.github/workflows/release.yml

@@ -19,7 +19,6 @@ jobs:
           fetch-depth: 0
       - uses: actions/setup-node@v3
         with:
-          node-version: 16
           cache: yarn
       - name: Cache node modules
         uses: actions/cache@v3

packages/graphql-language-service-server/README.md

@@ -34,11 +34,10 @@ Supported features include:
 
 ### Dependencies
 
-An LSP compatible client with its own file watcher, that sends watch
-notifications to the server.
-
-**DROPPED**: GraphQL Language Service no longer depends on
-[Watchman](https://facebook.github.io/watchman/)
+- An LSP compatible client with its own file watcher, that sends watch
+  notifications to the server, such as vscode, nvim, or sublime-lsp.
+- Node.js `^18.18.0 || >=20.9.0` or later is required.
+- (for now) a graphql config file is required
 
 ### Installation