Close out migration for libpq18

Author: regro-cf-autotick-bot

recipe/conda_build_config.yaml

@@ -659,7 +659,7 @@ libpng:
 libprotobuf:
   - 6.31.1
 libpq:
-  - '17'
+  - '18'
 libpulsar:
   - 4.0.1
 libraw:
@@ -887,9 +887,9 @@ poppler:
 portaudio:
   - '19.7'
 postgresql:
-  - '17'
+  - '18'
 postgresql_plpython:
-  - '17'
+  - '18'
 proj:
   - '9.7'
 pulseaudio: