Windows: update to libgit2 1.9.1

Author: jeroen

NEWS

@@ -1,3 +1,6 @@
+2.2.0
+  - Windows: update to libgit2 1.9.1
+
 2.1.4
   - Fix for libgit2 1.8.2 reverting their API change from 1.8.0
   - New parameter 'force' in git_branch_create() see #239

tools/winlibs.R

@@ -1,11 +1,11 @@
 if(!file.exists('clone.o') && !file.exists("../.deps/libgit2/include/git2.h")){
   unlink("../.deps", recursive = TRUE)
   url <- if(grepl("aarch", R.version$platform)){
-    "https://github.com/r-windows/bundles/releases/download/libgit2-1.7.2/libgit2-1.7.2-clang-aarch64.tar.xz"
+    "https://github.com/r-windows/bundles/releases/download/libgit2-1.9.1/libgit2-1.9.1-clang-aarch64.tar.xz"
   } else if(grepl("clang", Sys.getenv('R_COMPILED_BY'))){
-    "https://github.com/r-windows/bundles/releases/download/libgit2-1.7.2/libgit2-1.7.2-clang-x86_64.tar.xz"
+    "https://github.com/r-windows/bundles/releases/download/libgit2-1.9.1/libgit2-1.9.1-clang-x86_64.tar.xz"
   } else if(getRversion() >= "4.2") {
-    "https://github.com/r-windows/bundles/releases/download/libgit2-1.7.2/libgit2-1.7.2-ucrt-x86_64.tar.xz"
+    "https://github.com/r-windows/bundles/releases/download/libgit2-1.9.1/libgit2-1.9.1-ucrt-x86_64.tar.xz"
   } else {
     "https://github.com/rwinlib/libgit2/archive/v1.7.1.tar.gz"
   }