fix(deps): update dependency @actions/core to v2

node_modules/@actions/http-client/lib/index.d.ts

@@ -1,6 +1,3 @@
-/// <reference types="node" />
-/// <reference types="node" />
-/// <reference types="node" />
 import * as http from 'http';
 import * as ifm from './interfaces';
 import { ProxyAgent } from 'undici';
@@ -122,7 +119,22 @@ export declare class HttpClient {
     getAgentDispatcher(serverUrl: string): ProxyAgent | undefined;
     private _prepareRequest;
     private _mergeHeaders;
+    /**
+     * Gets an existing header value or returns a default.
+     * Handles converting number header values to strings since HTTP headers must be strings.
+     * Note: This returns string | string[] since some headers can have multiple values.
+     * For headers that must always be a single string (like Content-Type), use the
+     * specialized _getExistingOrDefaultContentTypeHeader method instead.
+     */
     private _getExistingOrDefaultHeader;
+    /**
+     * Specialized version of _getExistingOrDefaultHeader for Content-Type header.
+     * Always returns a single string (not an array) since Content-Type should be a single value.
+     * Converts arrays to comma-separated strings and numbers to strings to ensure type safety.
+     * This was split from _getExistingOrDefaultHeader to provide stricter typing for callers
+     * that assign the result to places expecting a string (e.g., additionalHeaders[Headers.ContentType]).
+     */
+    private _getExistingOrDefaultContentTypeHeader;
     private _getAgent;
     private _getProxyAgentDispatcher;
     private _performExponentialBackoff;