[igraph] update to 0.9.6 (#22379)

* [igraph] update to 0.9.6

* [igraph] x-add-version

* [igraph] fix using internal PLFIT

* [igraph] x-add-version

ports/igraph/portfile.cmake

@@ -4,9 +4,9 @@
 #  - The release tarball contains pre-generated parser sources, which eliminates the dependency on bison/flex.
 
 vcpkg_download_distfile(ARCHIVE
-    URLS "https://github.com/igraph/igraph/releases/download/0.9.5/igraph-0.9.5.tar.gz"
-    FILENAME "igraph-0.9.5.tar.gz"
-    SHA512 2eb562bb898ff19f8e4ebb2d9f3393000b66154cb87318999bbb920793657e4e3a0b52d10bc8cbe4d2c3a5d27258fd8156df97f778065a92b969bfcb7d9fc28c
+    URLS "https://github.com/igraph/igraph/releases/download/0.9.6/igraph-0.9.6.tar.gz"
+    FILENAME "igraph-0.9.6.tar.gz"
+    SHA512 2e83b81d7a5a0e526f0ad4ad12a7e31e8205f702715061c0c07155d66fcef30ccdb9dad962c50a26b00f4da0fe0e337e51294ff6c3b03cd855b6dfc41b54e306
 )
 
 vcpkg_extract_source_archive_ex(
@@ -47,6 +47,8 @@ vcpkg_cmake_configure(
         -DIGRAPH_USE_INTERNAL_GLPK=ON
         # Currently, external GMP provides no performance or functionality benefits.
         -DIGRAPH_USE_INTERNAL_GMP=ON
+        # PLFIT is not yet available in vcpkg.
+        -DIGRAPH_USE_INTERNAL_PLFIT=ON
         -DF2C_EXTERNAL_ARITH_HEADER=${ARITH_H}
         ${FEATURE_OPTIONS}
 )

ports/igraph/vcpkg.json

@@ -1,6 +1,6 @@
 {
   "name": "igraph",
-  "version": "0.9.5",
+  "version": "0.9.6",
   "description": "igraph is a C library for network analysis and graph theory, with an emphasis on efficiency portability and ease of use.",
   "homepage": "https://igraph.org/",
   "dependencies": [

versions/baseline.json

@@ -2825,7 +2825,7 @@
       "port-version": 1
     },
     "igraph": {
-      "baseline": "0.9.5",
+      "baseline": "0.9.6",
       "port-version": 0
     },
     "iir1": {

versions/i-/igraph.json

@@ -1,5 +1,10 @@
 {
   "versions": [
+    {
+      "git-tree": "75f0a463ec9ebb92fdc9f67f3da0a849cae3f4e2",
+      "version": "0.9.6",
+      "port-version": 0
+    },
     {
       "git-tree": "e1ad33d42918b67a81d068be60950b488829811f",
       "version": "0.9.5",