Example with "SHA256" checksum of 52 bytes

[reynir]

I was looking for examples to test on https://tools.spdx.org/app/validate/ and the first example I find here was invalid - and indeed, the alleged SHA256 checksum is too long.

https://github.com/spdx/spdx-examples/blame/6f8f8bf24bdd0ee03ab56e9dd54d444c1a71b9d8/software/example11/spdx2.3/sbom.spdx.json#L69