Bump gitian-builder submodule

[abitmore]

The PR "Add --fetch-branches and --fetch-tags options" has been merged, thus the step cc319c4 is no longer needed, but the newly added options need to be specified when building.

[abitmore]

Update:

The gitian-builder project has been updated to maintenance mode as of Nov 22, 2021.

Due to the move of Bitcoin Core to Guix, this repository is switching to maintenance mode. Only serious bugs (including security issues) will be considered going forward.

The https://gitian.org/ site currently consists of only a small page, with a link to the gitian-builder project, but no links to projects using it.

Gitian

Gitian is a secure source-control oriented software distribution method. This means you can download trusted binaries that are verified by multiple builders.

Gitian uses a deterministic build process to allow multiple builders to create identical binaries. This allows multiple parties to sign the resulting binaries, guaranteeing that the binaries and tool chain were not tampered with and that the same source was used. It removes the build and distribution process as a single point of failure.

Gitian Builder

The Gitian Builder was previously used by Bitcoin Core for deterministic builds for about 10 years. However, they recently moved to Guix, and this project is now archived.

Why

• A group of builders is much more trustworthy than just one
• Friends don't let friends run untrusted binaries
• Create a secure and easy-to-use software upgrade process

By devrandom.