release version 18.00.0003

[davecramer]

Bump version to 18.00.0003 (configure.ac, version.h) and add the 18.00.0003 release notes.

Covers the PRs merged since 18.00.0002 (#195): #196, #197, #199, #201, #202, #203/#204, #205, #206, #207/#210/#211, #208/#209.

[singhpratech]

Built REL-18_00_0003 from the tag on Ubuntu 24.04 (libpq 16.15, unixODBC 2.3.12) and re-ran the programs from #207 and #208: out-of-range integer reads return 22003 with the buffer and indicator untouched on both SQLGetData and SQLBindCol, and on QuestDB a statement freed before the commit no longer costs the rows (16.00 lost both). Both rows in the adbcBridge upstream tracker (https://github.com/singhpratech/adbcbridge/blob/main/docs/UPSTREAM.md) now read fixed in 18.00.0003. Thank you for shipping all three in one release, Dave.