You have 2.2.4. It was added in 2.2.5.

From the NEWS file:

Changes in 2.2.5 (since 2.2.4):
....
** New 'get-bytevector-some!' I/O primitive.

-Dale

	-----------------------------------------From: "Roel Janssen" 
To: 44371@debbugs.gnu.org
Cc: 
Sent: Sunday November 1 2020 9:42:07AM
Subject: bug#44371: Missing 'get-bytevector-some!' in Guile 2.2

Dear Guix,

 I installed guile-2.2 on Debian 10.6 and I seem to missing the "get-
 bytevector-some!" procedure from "(ice-9 binary-ports)":

 ----------
 # guile
 GNU Guile 2.2.4
 Copyright (C) 1995-2017 Free Software Foundation, Inc.

 Guile comes with ABSOLUTELY NO WARRANTY; for details type `,show w'.
 This program is free software, and you are welcome to redistribute it
 under certain conditions; type `,show c' for details.

 Enter `,help' for help.
 scheme@(guile-user)> ,use (ice-9 binary-ports)
 scheme@(guile-user)> get-bytevector-some!
 ;;; : warning: possibly unbound variable `get-
 bytevector-some!'
 ERROR: In procedure module-lookup: Unbound variable: get-bytevector-
 some!

 Entering a new prompt. Type `,bt' for a backtrace or `,q' to
 continue.
 scheme@(guile-user) [1]> ,q
 scheme@(guile-user)> get-bytevector-some
 $1 = #
 ----------

 Kind regards,
 Roel Janssen