update internal GRUB2 bootloader for Ubuntu 23.04

* Yet another example in the long list of how not releasing your project IN A
  TIMELY MANNER is creating HUGE PROBLEMS downstream... Looking at you GRUB!!!
* Closes pbatard#2233

res/grub2/readme.txt

@@ -1,8 +1,9 @@
 This directory contains the Grub 2.0 boot records that are used by Rufus
 
-* boot.img and core.img were created from:
-    https://ftp.gnu.org/gnu/grub/grub-2.06.tar.xz
-  on a Debian 10.9 x64 system using the commands:
+* Because of issue #2233, boot.img and core.img were created from the GRUB git
+  source (@e67a551a48192a04ab705fca832d82f850162b64) obtained on 2023.04.25 from:
+    https://git.savannah.gnu.org/cgit/grub.git/tree/?id=e67a551a48192a04ab705fca832d82f850162b64
+  on a Debian 11.6 x64 system using the commands:
     ./autogen.sh
     # --enable-boot-time for Manjaro Linux
     ./configure --disable-nls --enable-boot-time

src/rufus.rc

@@ -33,7 +33,7 @@ LANGUAGE LANG_NEUTRAL, SUBLANG_NEUTRAL
 IDD_DIALOG DIALOGEX 12, 12, 232, 326
 STYLE DS_SETFONT | DS_MODALFRAME | DS_CENTER | WS_MINIMIZEBOX | WS_POPUP | WS_CAPTION | WS_SYSMENU
 EXSTYLE WS_EX_ACCEPTFILES
-CAPTION "Rufus 4.0.2033"
+CAPTION "Rufus 4.0.2034"
 FONT 9, "Segoe UI Symbol", 400, 0, 0x0
 BEGIN
     LTEXT           "Drive Properties",IDS_DRIVE_PROPERTIES_TXT,8,6,53,12,NOT WS_GROUP
@@ -392,8 +392,8 @@ END
 //
 
 VS_VERSION_INFO VERSIONINFO
- FILEVERSION 4,0,2033,0
- PRODUCTVERSION 4,0,2033,0
+ FILEVERSION 4,0,2034,0
+ PRODUCTVERSION 4,0,2034,0
  FILEFLAGSMASK 0x3fL
 #ifdef _DEBUG
  FILEFLAGS 0x1L
@@ -411,13 +411,13 @@ BEGIN
             VALUE "Comments", "https://rufus.ie"
             VALUE "CompanyName", "Akeo Consulting"
             VALUE "FileDescription", "Rufus"
-            VALUE "FileVersion", "4.0.2033"
+            VALUE "FileVersion", "4.0.2034"
             VALUE "InternalName", "Rufus"
             VALUE "LegalCopyright", "© 2011-2023 Pete Batard (GPL v3)"
             VALUE "LegalTrademarks", "https://www.gnu.org/licenses/gpl-3.0.html"
             VALUE "OriginalFilename", "rufus-4.0.exe"
             VALUE "ProductName", "Rufus"
-            VALUE "ProductVersion", "4.0.2033"
+            VALUE "ProductVersion", "4.0.2034"
         END
     END
     BLOCK "VarFileInfo"