FeatherPad: update to 1.5.1

[voidisnull]

Testing the changes

• I tested the changes in this PR: YES

Local build testing

• I built this PR locally for my native architecture, (x86_64-musl)
• I built this PR locally for these architectures:
  • x86_64-glibc
  • i686
    @yjp20 could you please review the changes?? And thanks for your time