tools: bump windows tools installer version to v2.1

Includes the following changes:

80ad09f23 allow changing the installation path
(a fix for https://github.com/espressif/esp-idf/issues/3806)

9c5284e7b verify that IDF_PATH doesn't contain spaces

aaf3dcbda fix quoting of IDF_TOOLS_PATH
(a fix for https://github.com/espressif/esp-idf/issues/3807)

e6e179294 tools: update idf_exe to 1.0.1
76dc87e9a idf_exe: fix NULL pointer passed to WriteFile
(fixes for https://github.com/espressif/esp-idf/issues/3740)

tools/windows/tool_setup/idf_tool_setup.iss

@@ -5,7 +5,7 @@
 #include <idp.iss>
 
 #define MyAppName "ESP-IDF Tools"
-#define MyAppVersion "2.0"
+#define MyAppVersion "2.1"
 #define MyAppPublisher "Espressif Systems (Shanghai) Co. Ltd."
 #define MyAppURL "https://github.com/espressif/esp-idf"