Update README, snap version, and tag

Author: github-actions[bot]

README.md

@@ -466,7 +466,7 @@ also often get polled from the printer.
   - c2050 debian/0.3-7
   - cjet debian/0.8.9-11
   - min12xxw debian/0.0.9-11
-  - pnm2ppa debian/1.13-13
+  - pnm2ppa debian/1.13-14
   - c2esp debian/27-11
   - dymo-cups-drivers debian/1.4.0-12
   - foo2zjs debian/20200505dfsg0-4

rockcraft.yaml

@@ -1,6 +1,6 @@
 name: ghostscript-printer-app
 base: ubuntu@22.04
-version: '10.06.0-3'
+version: '10.06.0-4'
 summary: Ghostscript Printer Application
 description: |
   The Ghostscript Printer Application is a PAPPL (Printer Application
@@ -882,7 +882,7 @@ parts:
     # Original homepage: http://pnm2ppa.sourceforge.net/
     source: https://salsa.debian.org/printing-team/pnm2ppa.git
     source-type: git
-    source-tag: debian/1.13-13
+    source-tag: 'debian/1.13-14'
     source-depth: 1
 # ext:updatesnap
 #   version-format: