👷‍♀️ Update test matrix

Node.js 20 was [end-of-lifed][1] in March 2026.
Postgres 13 was [end-of-lifed][2] in November 2025

[1]: https://nodejs.org/en/about/previous-releases
[2]: https://www.postgresql.org/support/versioning/

Author: alecgibson

.github/workflows/test.yml

@@ -16,14 +16,15 @@ jobs:
       fail-fast: false
       matrix:
         node:
-        - 16
-        - 18
-        - 20
+        - 22
+        - 24
+        - 26
         postgres:
-        - 13
         - 14
         - 15
         - 16
+        - 17
+        - 18
     services:
       postgres:
         image: postgres:${{ matrix.postgres }}