feat(c/driver/postgresql): Int8 support

[WillAyd]

No description provided.

[lidavidm]

Hmm, not sure what's going on with GLib, I'll file a separate issue

[kou]

Ah, arrow-c-glib conda package was released recently. It'll be related.
Anyway, it's not related to this pull request.

[kou]

The following change on apache/arrow will solve this but we can't use it here. So we may want to pin red-arrow to 11.0.0 here as a workaround.

diff --git a/ruby/red-arrow/ext/arrow/extconf.rb b/ruby/red-arrow/ext/arrow/extconf.rb
index 7f05d4b3d..8043bb689 100644
--- a/ruby/red-arrow/ext/arrow/extconf.rb
+++ b/ruby/red-arrow/ext/arrow/extconf.rb
@@ -41,8 +41,6 @@ end
 unless required_pkg_config_package([
                                      "arrow",
                                      Arrow::Version::MAJOR,
-                                     Arrow::Version::MINOR,
-                                     Arrow::Version::MICRO,
                                    ],
                                    conda: "libarrow",
                                    debian: "libarrow-dev",

[kou]

Oh, sorry. I should have written them to #859.