Bump MSRV to 1.91

Clara Englerrequested to merge
cve/arti:msrv-1.91 into main

This commit bumps the MSRV to 1.91 which was released on 2025-10-30.

git ls-files | \
    grep ".*Cargo\.toml$" | \
    xargs sed -i '' 's/^rust-version = "1\.89"$/rust-version = "1\.91"/g'

The following files were updated manually:

            modified:   .gitlab-ci.yml
            modified:   README.md
            modified:   flake.nix
            modified:   maint/docker-android/Dockerfile
Edited by Clara Engler

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