package/gesftpserver: update GESFTPSERVER_CPE_ID_VENDOR

cpe:2.3:a:green_end:sftpserver has been deprecated in favor of
cpe:2.3:a:greenend:sftpserver in December 2022:

 <cpe-item name="cpe:/a:green_end:sftpserver:0.2.2" deprecated="true" deprecation_date="2022-12-30T17:53:22.797Z">
      <reference href="https://github.com/ewxrjk/sftpserver/releases">Version</reference>
      <reference href="http://www.greenend.org.uk/rjk/sftpserver/">Product</reference>
    <cpe-23:cpe23-item name="cpe:2.3:a:green_end:sftpserver:0.2.2:*:*:*:*:*:*:*">
        <cpe-23:deprecated-by name="cpe:2.3:a:greenend:sftpserver:0.2.2:*:*:*:*:*:*:*" type="NAME_CORRECTION"/>

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
(cherry picked from commit 4adc8b3d24708f180bcbf68df1d0723dc058f68e)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/gesftpserver/gesftpserver.mk

@@ -12,7 +12,7 @@ GESFTPSERVER_LICENSE_FILES = COPYING
 
 # "Missing prototype" warning treated as error
 GESFTPSERVER_CONF_OPTS = --disable-warnings-as-errors
-GESFTPSERVER_CPE_ID_VENDOR = green_end
+GESFTPSERVER_CPE_ID_VENDOR = greenend
 GESFTPSERVER_CPE_ID_PRODUCT = sftpserver
 
 # forgets to link against pthread when cross compiling