Update LICENSE.txt for remote-only FSF

Ben Beasleyrequested to merge
musicinmybrain/sequoia-keystore:no-fsf-address into main

The Free Software Foundation is now remote-only, and no longer has a physical mailing address. The license text and copyright/license notice in LICENSE.txt are updated based on the current contents of https://www.gnu.org/licenses/old-licenses/lgpl-2.0.txt.

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