Remove old caching code

src/cache-utils.ts

@@ -1,17 +1,3 @@
-import * as path from 'path'
-import * as glob from '@actions/glob'
-
-export async function hashFiles(
-    baseDir: string,
-    patterns: string[] = ['**'],
-    followSymbolicLinks = false
-): Promise<string | null> {
-    const combinedPatterns = patterns
-        .map(pattern => `${baseDir}${path.sep}${pattern}`)
-        .join('\n')
-    return glob.hashFiles(combinedPatterns, {followSymbolicLinks})
-}
-
 export function truncateArgs(args: string): string {
     return args.trim().replace(/\s+/g, ' ').substr(0, 400)
 }