security/gpg-tui: update to 0.8.1

[0.8.1] - 2021-10-10

Added:
-Support changing the default file explorer

Changed:
-Include the manpage of configuration file in binary releases
-Allow dead code for event handler fields
-Apply clippy::needless_lifetimes suggestion
-Improve the Docker build and push workflow
-Merge the build and test steps in CI workflow
-Disable the terminal buffer check temporarily
-Disable the gpg info renderer test
-Bump dependencies

Fixed:
-Use implicit reference for state module tests
-Use a fixed line width for renderer tests

Removed:
-Remove the hardcoded last character from renderer tests

(pin)