fix(cache): etag constraint violation

Signed-off-by: skjnldsv <skjnldsv@protonmail.com>

lib/private/Files/Cache/CacheQueryBuilder.php

@@ -48,7 +48,7 @@ class CacheQueryBuilder extends ExtendedQueryBuilder {
 	public function selectFileCache(?string $alias = null, bool $joinExtendedCache = true) {
 		$name = $alias ?: 'filecache';
 		$this->select("$name.fileid", 'storage', 'path', 'path_hash', "$name.parent", "$name.name", 'mimetype', 'mimepart', 'size', 'mtime',
-			'storage_mtime', 'encrypted', 'etag', "$name.permissions", 'checksum', 'unencrypted_size')
+			'storage_mtime', 'encrypted', "$name.etag", "$name.permissions", 'checksum', 'unencrypted_size')
 			->from('filecache', $name);
 
 		if ($joinExtendedCache) {