devel/R-cran-filelock: Update to 1.0.3

• Take maintainership
• Switch WWW url to CRAN.r-project.org
• Remove unneeded test dependencies

ChangeLog:
https://cran.r-project.org/web/packages/filelock/news/news.html
https://github.com/r-lib/filelock/compare/v1.0.2...v1.0.3