Normalize CRLF line endings in install/PackageConfig.cmake.in

[traversaro]

The install/PackageConfig.cmake.in file is the only file in the repo with CRLF line endings, while all the other files use the regular LF line endings, as you can see with the command:

traversaro@IITBMP014LW012:~/zenoh-cpp$ grep -rIl --exclude-dir='.git' $'\r' .
./install/PackageConfig.cmake.in

This is problematic when creating a patch that involves both install/PackageConfig.cmake.in and other files. For this reason, this PR proposes to normalize the install/PackageConfig.cmake.in file and use LF line endings also there.

The file content is not modified in any other way.

This PR is similar to https://github.com/eclipse-zenoh/zenoh-c/pull/1005, as the same problem was also in the zenoh-c repo.

[github-actions[bot]]

PR missing one of the required labels: {'bug', 'internal', 'breaking-change', 'dependencies', 'new feature', 'documentation', 'enhancement'}