shim 15.7

What's Changed
* Make SBAT variable payload introspectable by @chrisccoulson in https://github.com/rhboot/shim/pull/483
* Reference MokListRT instead of MokList by @esnowberg in https://github.com/rhboot/shim/pull/488
* Add a link to the test plan in the readme. by @vathpela in https://github.com/rhboot/shim/pull/494
* [V3] Enable TDX measurement to RTMR register by @kenplusplus in https://github.com/rhboot/shim/pull/485
* Discard load-options that start with a NUL by @frozencemetery in https://github.com/rhboot/shim/pull/505
* load_cert_file bugs by @esnowberg in https://github.com/rhboot/shim/pull/523
* Add -malign-double to IA32 compiler flags by @nicholasbishop in https://github.com/rhboot/shim/pull/516
* pe: Fix image section entry-point validation by @iokomin in https://github.com/rhboot/shim/pull/518
* make-archive: Build reproducible tarball by @julian-klode in https://github.com/rhboot/shim/pull/527
* mok: remove MokListTrusted from PCR 7 by @baloo in https://github.com/rhboot/shim/pull/519
* Shim 15.7 version update by @vathpela in https://github.com/rhboot/shim/pull/528

New Contributors
* @kenplusplus made their first contribution in https://github.com/rhboot/shim/pull/485
* @iokomin made their first contribution in https://github.com/rhboot/shim/pull/518
* @baloo made their first contribution in https://github.com/rhboot/shim/pull/519

**Full Changelog**: https://github.com/rhboot/shim/compare/15.6...15.7
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