Support Python 3.13 and PostgreSQL 17.

Improvements

• Implement GSSAPI authentication
  (by @eltoder in 1d4e568 for #1122)

• Implement SSPI authentication
  (by @eltoder in 1aab209 for #1128)

• Add initial typings
  (by @bryanforbes in d42432b for #1127)

• Allow building with Cython 3
  (by @musicinmybrain in 258d8a9 for #1101)

• docs: fix connection pool close call (#1125)
  (by @paulovitorweb in e848814 for #1125)

• Add support for the sslnegotiation parameter
  (by @elprans in afdb05c for #1187)

• Test and build on Python 3.13
  (by @elprans in 3aa9894 for #1188)

• Support PostgreSQL 17
  (by @elprans in cee97e1 for #1189)
  (by @MeggyCal in aa2d0e6 for #1185)

• Add fetchmany to execute many and return rows
  (by @rossmacarthur in 73f2209 for #1175)

• Add connect kwarg to Pool to better support GCP's CloudSQL
  (by @d1manson in 3ee19ba for #1170)

• Allow customizing connection state reset (#1191)
  (by @elprans in f6ec755 for #1191)

Fixes

• s/quote/quote_plus/ in the note about DSN part quoting
  (by @elprans in 1194a8a for #1151)

• Use asyncio.run() instead of run_until_complete()
  (by @eltoder in 9fcddfc for #1140)

• Require async_timeout for python < 3.11 (#1177)
  (by @Pliner in 327f2a7 for #1177)

• Allow testing with uvloop on Python 3.12 (#1182)
  (by @musicinmybrain in 597fe54 for #1182)

• Mark pool-wrapped connection coroutine methods as coroutines
  (by @elprans in 636420b for #1134)

• handle None parameters in copy_from_query, returning NULL
  (by @fobispotc in 259d16e for #1180)

• fix: return the pool from async_init_ if it's already initialized (#1104)
  (by @guacs in 7dc5872 for #1104)

• Replace obsolete, unsafe Py_TRASHCAN_SAFE_BEGIN/END (#1150)
  (by @musicinmybrain in 11101c6 for #1150)