Update integration test golden masters for Arduino Lint 1.2.1

The integration tests for the sync command compare the generated output against "golden masters" stored in test data
files.

These files must be updated after there are intended output differences that result from development on this project or
tools it uses. In this case, the formatting and content of Arduino Lint's output has been enhanced since the time of the
1.2.0 release previously in use by libraries-repository-engine's sync command.

The "golden masters" are hereby updated to match the expected output of `libraries-repository-engine sync` when using
Arduino Lint 1.2.1.

Author: per1234