remove attest lib

src/sbom.ts

@@ -1,5 +1,4 @@
 import fs from 'fs'
-import { Predicate } from '@actions/attest'
 import * as path from 'path'
 
 export type SBOM = {
@@ -7,6 +6,11 @@ export type SBOM = {
   object: object
 }
 
+type Predicate = {
+  type: string
+  params: object
+}
+
 export async function parseSBOMFromPath(filePath: string): Promise<SBOM> {
   // Read the file content
   const fileContent = await fs.promises.readFile(filePath, 'utf8')