[Bug]: all statements with `.` are reported as external calls

Describe the issue:

I ran slither . --print function-summary to view external calls for functions. The resulting "External Calls" column treats any statement with a . as an external call. This includes solidity built-ins like abi.encode, library accesses like Address.sendValue, and struct field accesses.

Code example to reproduce the issue:

git clone https://github.com/scopelift/pooltogether-governor-upgrade/
cd pooltogether-governor-upgrade
forge install
slither . --print function-summary

Version:

0.9.6

Relevant log output:

No response