chore(setup): remove duplicated info

The same information is found in both `setup.py` and `setup.cfg`, favor
the one in `setup.cfg`.
2 jobs for remove-duplicated-info in 1 minute and 42 seconds (queued for 1 second)
latest
Status Job ID Name Coverage
  Check
passed #1169825
flake8

00:01:42

failed #1169826
allowed to fail
mypy

00:01:33

 
Name Stage Failure
failed
mypy Check
gidocgen/gir/parser.py:813: error: Argument "gtype" to "Boxed" has incompatible type "Optional[GType]"; expected "GType"
gidocgen/gir/parser.py:831: error: Argument "get_type" to "GType" has incompatible type "Optional[str]"; expected "str"
gidocgen/gir/parser.py:873: error: Argument "get_type" to "GType" has incompatible type "Optional[str]"; expected "str"
gidocgen/gir/parser.py:895: error: Argument "name" to "Union" has incompatible type "Optional[str]"; expected "str"
gidocgen/gir/parser.py:895: error: Argument "symbol_prefix" to "Union" has incompatible type "Optional[str]"; expected "str"
gidocgen/gir/parser.py:895: error: Argument "ctype" to "Union" has incompatible type "Optional[str]"; expected "str"
Found 107 errors in 3 files (checked 14 source files)
Cleaning up file based variables
ERROR: Job failed: exit code 1