Fix D1 exports to properly pad HEX strings for binary values (#7701)

* Fix D1 exports to properly pad HEX strings for binary values

The export logic was corrupting data when a binary value was being converted into HEX strings, and one of the bytes had a leading zero.

Closes #6452

* Create green-dodos-push.md

Author: lambrospetrou

.changeset/green-dodos-push.md

@@ -0,0 +1,5 @@
+---
+"miniflare": patch
+---
+
+Fix D1 exports to properly pad HEX strings for binary values.

packages/miniflare/src/workers/d1/dumpSql.ts

@@ -71,7 +71,7 @@ export function* dumpSql(
 					return outputQuotedEscapedString(cell);
 				} else if (cell instanceof ArrayBuffer) {
 					return `X'${Array.prototype.map
-						.call(new Uint8Array(cell), (b) => b.toString(16))
+						.call(new Uint8Array(cell), (b) => b.toString(16).padStart(2, "0"))
 						.join("")}'`;
 				} else {
 					console.log({ colType, cellType, cell, column: columns[i] });