meta: fix AWS test suite (#5229)

* Backport #5195 to 4.x

Co-authored-by: Antoine du Hamel <antoine@transloadit.com>

* fixup! Backport #5195 to 4.x

---------

Co-authored-by: Merlijn Vos <merlijn@soverin.net>

packages/@uppy/aws-s3/src/index.test.ts

@@ -91,6 +91,7 @@ describe('AwsS3Multipart', () => {
       expect(uploadSuccessHandler.mock.calls[0][1]).toStrictEqual({
         body: {
           ETag: 'test',
+          etag: 'test',
           location: 'http://example.com',
         },
         status: 200,