*/*: Remove expired ports:

2020-12-31 lang/pypy3: Uses Python 2.7 which is EOLed upstream
2020-12-31 lang/pypy: Uses Python 2.7 which is EOLed upstream
2021-06-23 databases/pypy-gdbm: Uses EOL Python 2.7 via lang/pypy
2021-06-23 databases/pypy-sqlite3: Uses EOL Python 2.7 via lang/pypy
2021-06-23 x11-toolkits/pypy-tkinter: Uses EOL Python 2.7 via lang/pypy