Add Buffer | ReadableStream to determinsticArchive arg type

We don't use these types for anything yet, so this is just for our own
reference purposes.

This argument is passed through to archiver, which can accept these
types.

src/deterministicArchive.js

@@ -64,7 +64,7 @@ async function resolveFilesRecursive(...dirsAndFiles) {
  * Creates a deterministic archive of the given files
  *
  * @param {string[]} dirsAndFiles
- * @param {{name: string, content: string}[]} contentToArchive
+ * @param {{name: string, content: string | Buffer | ReadableStream}[]} contentToArchive
  * @returns {Promise<{buffer: Buffer, hash: string}>}
  */
 export default async function deterministicArchive(