fix: use flock to check dpkg lock instead of ps scan - #771

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The function 'isDpkgLocked' is never used.

Consider using std::any_of algorithm instead of a raw loop.

Include file: <sys/file.h> not found. Please note: Cppcheck does not need standard library headers to get proper results.

Include file: <fcntl.h> not found. Please note: Cppcheck does not need standard library headers to get proper results.

Include file: <unistd.h> not found. Please note: Cppcheck does not need standard library headers to get proper results.