Update Bitlocker minimum password length 4

src/modules/module_22100.c

@@ -81,7 +81,10 @@ u64 module_tmp_size (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSED c
 
 u32 module_pw_min (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSED const user_options_t *user_options, MAYBE_UNUSED const user_options_extra_t *user_options_extra)
 {
-  const u32 pw_min = 8;
+  // https://docs.microsoft.com/en-us/windows/security/information-protection/bitlocker/bitlocker-group-policy-settings
+  // The startup PIN must have a minimum length of 4 digits, and it can have a maximum length of 20 digits. By default, the minimum PIN length is 6.
+
+  const u32 pw_min = 4;
 
   return pw_min;
 }