[SVLS-8378] update yarn in all places

Author: ava-silver

.github/workflows/build.yml

@@ -15,6 +15,9 @@ jobs:
         with:
           node-version: 24
 
+      - name: Set up Yarn
+        run: corepack enable && corepack prepare yarn@4.10.3 --activate
+
       - name: Cache Node modules
         id: cache-node-modules
         uses: actions/cache@0c907a75c2c80ebcb7f088228285e798b750cf8f # v4.2.1
@@ -54,6 +57,9 @@ jobs:
         with:
           node-version: ${{ matrix.node-version }}
 
+      - name: Set up Yarn
+        run: corepack enable && corepack prepare yarn@4.10.3 --activate
+
       - name: Cache Node modules
         id: cache-node-modules
         uses: actions/cache@0c907a75c2c80ebcb7f088228285e798b750cf8f # v4.2.1

.github/workflows/integration_tests.yml

@@ -15,6 +15,9 @@ jobs:
         with:
           node-version: 24
 
+      - name: Set up Yarn
+        run: corepack enable && corepack prepare yarn@4.10.3 --activate
+
       - name: Cache Node modules
         id: cache-node-modules
         uses: actions/cache@0c907a75c2c80ebcb7f088228285e798b750cf8f # v4.2.1

.github/workflows/monitor_api_integration_test.yml

@@ -19,6 +19,9 @@ jobs:
         with:
           node-version: 24
 
+      - name: Set up Yarn
+        run: corepack enable && corepack prepare yarn@4.10.3 --activate
+
       - name: Cache Node modules
         id: cache-node-modules
         uses: actions/cache@0c907a75c2c80ebcb7f088228285e798b750cf8f # v4.2.1

.gitignore

@@ -9,4 +9,11 @@ package-lock.json
 test_forwarder_snapshot.json
 test_extension_snapshot.json
 test_extension_apigateway.json
-.node-version
+.node-version
+.pnp.*
+.yarn/*
+!.yarn/patches
+!.yarn/plugins
+!.yarn/releases
+!.yarn/sdks
+!.yarn/versions

.yarnrc.yml

@@ -0,0 +1 @@
+nodeLinker: node-modules

CONTRIBUTING.md

@@ -9,7 +9,7 @@ We love pull requests. Here's a quick guide.
     yarn install
     ```
 1. Make your changes.
-1. Test your changes against your own testing application with the help of [`yarn link`](https://classic.yarnpkg.com/en/docs/cli/link/):
+1. Test your changes against your own testing application with the help of [`yarn link`](https://yarnpkg.com/cli/link):
     ```bash
     # From the root of the serverless-plugin-datadog repo
     yarn build

package.json

@@ -63,5 +63,5 @@
   "peerDependencies": {
     "serverless": "4.x || 3.x || 2.x || 1.x"
   },
-  "packageManager": "yarn@1.22.22+sha512.a6b2f7906b721bba3d67d4aff083df04dad64c399707841b7acf00f6b133b7ac24255f2652fa22ae3534329dc6180534e98d17432037ff6fd140556e2bb3137e"
+  "packageManager": "yarn@4.10.3"
 }