Release: v0.9.0 (#354)

## What's Changed
* Deprecate v0 series by @sethvargo in
https://github.com/google-github-actions/auth/pull/350


**Full Changelog**:
https://github.com/google-github-actions/auth/compare/v1.2.0...10c546c93592afd28b8e788c08795743aed6180c

package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "@google-github-actions/auth",
-  "version": "0.8.3",
+  "version": "0.9.0",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "@google-github-actions/auth",
-      "version": "0.8.3",
+      "version": "0.9.0",
       "license": "Apache-2.0",
       "dependencies": {
         "@actions/core": "^1.10.0",

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@google-github-actions/auth",
-  "version": "0.8.3",
+  "version": "0.9.0",
   "description": "Authenticate to Google Cloud using OIDC tokens or JSON service account keys.",
   "main": "dist/main/index.js",
   "scripts": {

src/main.ts

@@ -4,6 +4,7 @@ import { join as pathjoin } from 'path';
 
 import {
   debug as logDebug,
+  error as logError,
   exportVariable,
   getBooleanInput,
   getIDToken,
@@ -45,6 +46,17 @@ const oidcWarning =
  * Executes the main action.
  */
 async function run(): Promise<void> {
+  // v0 is deprecated and is no longer supported per our "two major versions"
+  // policy.
+  logError(
+    `The v0 series of google-github-actions/auth is no longer maintained. It ` +
+      `will not receive updates, improvements, or security patches. Please ` +
+      `upgrade to the latest supported versions: ` +
+      `\n` +
+      `\n` +
+      `    https://github.com/google-github-actions/auth`,
+  );
+
   // Warn if pinned to HEAD
   if (isPinnedToHead()) {
     logWarning(pinnedToHeadWarning('v0'));