[plplot] Fix download errors (#34441)

ports/plplot/portfile.cmake

@@ -3,7 +3,7 @@ vcpkg_minimum_required(VERSION 2022-10-12) # for ${VERSION}
 vcpkg_from_sourceforge(
     OUT_SOURCE_PATH SOURCE_PATH
     REPO plplot/plplot
-    REF "${VERSION} Source"
+    REF "${VERSION}%20Source"
     FILENAME "plplot-${VERSION}.tar.gz"
     SHA512 54533245569b724a7ef90392cc6e9ae65873e6cbab923df0f841c8b43def5e4307690894c7681802209bd3c8df97f54285310a706428f79b3340cce3207087c8
     PATCHES

ports/plplot/vcpkg.json

@@ -1,7 +1,7 @@
 {
   "name": "plplot",
   "version-semver": "5.15.0",
-  "port-version": 1,
+  "port-version": 2,
   "description": "PLplot is a cross-platform software package for creating scientific plots whose (UTF-8) plot symbols and text are limited in practice only by what Unicode-aware system fonts are installed on a user's computer.",
   "homepage": "http://plplot.org/",
   "license": null,

versions/baseline.json

@@ -6510,7 +6510,7 @@
     },
     "plplot": {
       "baseline": "5.15.0",
-      "port-version": 1
+      "port-version": 2
     },
     "plustache": {
       "baseline": "0.4.0",

versions/p-/plplot.json

@@ -1,5 +1,10 @@
 {
   "versions": [
+    {
+      "git-tree": "650f7b8973b4a28f84fc0e8ab1711e468417f564",
+      "version-semver": "5.15.0",
+      "port-version": 2
+    },
     {
       "git-tree": "3fb1fa2f2f5f9c3ea3543f5ba3074138be2d2320",
       "version-semver": "5.15.0",