Also, upstream hasn't been updated since July 2022.

Since I no longer have access to the software requiring this module I disown it again.

Patching PKGBUILD:

diff --git a/PKGBUILD b/PKGBUILD
index e41ac49..8be93a4 100644
--- a/PKGBUILD
+++ b/PKGBUILD
@@ -1,8 +1,8 @@
 # Maintainer: Josip Ponjavic <josipponjavic at gmail dot com>

 pkgname=python-iso3166
-pkgver=1.0.1
-pkgrel=3
+pkgver=2.1.1
+pkgrel=1
 pkgdesc="Self-contained ISO 3166-1 country definitions."
 arch=('any')
 url="https://github.com/deactivated/python-iso3166"
@@ -10,7 +10,7 @@ license=('MIT')
 depends=('python')
 makedepends=('python-setuptools')
 source=("$pkgname-$pkgver.tar.gz::$url/archive/v$pkgver.tar.gz")
-sha256sums=('fce7996caab1afdee49958e38440cdaa3816f5dd2532839ea01b5b7495ce74a3')
+sha256sums=('89e6b3d2afff9faf320faa826a2b081853200fdd5acd5362d770fe252d0c258b')

 build() {
   cd "$srcdir/$pkgname-$pkgver"

Will update the package later today.

Build failes due to mismatched sha256sums. PKGBUILD says 462304b5eb53453d13c6ab2adb3d4a57aad01f4b190b01abc27af5ccede35f40 iso3166-0.7.zip is 01eea77070c9ca18bd369774de4c7ff4e70295342785803a6b1ead9e0f0f5fcb