RSS: add v0.18.5.1 - #94

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/cache@v4, actions/checkout@v4, docker/login-action@v3, dorny/paths-filter@v3. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

FAILED: https://downloads.getmonero.org/monero-gui-v0.18.5.1/gui/monero-gui-source-v0.18.5.1.tar.bz2

FAILED: https://downloads.getmonero.org/monero-gui-v0.18.5.1/gui/monero-gui-win-x64-v0.18.5.1.zip

FAILED: https://downloads.getmonero.org/monero-gui-v0.18.5.1/gui/monero-gui-mac-x64-v0.18.5.1.dmg

FAILED: https://downloads.getmonero.org/monero-gui-v0.18.5.1/gui/monero-gui-mac-armv8-v0.18.5.1.dmg

FAILED: https://downloads.getmonero.org/monero-gui-v0.18.5.1/gui/monero-gui-linux-x64-v0.18.5.1.tar.bz2

FAILED: https://downloads.getmonero.org/monero-gui-v0.18.5.1/gui/monero-gui-install-win-x64-v0.18.5.1.exe

FAILED: https://downloads.getmonero.org/hashes-v0.18.5.1.txt