rebar.config: Update required OTP version 25.2.3

Since anyway we need debian12 for other reasons, like newer kernel, then
also require OTP from debian12 which is the one being tested and we want
to support. At the moment, debian12 OTP package version is 25.2.3.
I am personally building with Archlinux's package version 26.2.2.

Change-Id: I0ac7c93adbe88e1b738f1319cf1280c119ed59d1
---
M rebar.config
1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/rebar.config b/rebar.config
index 2403243..e72b908 100644
--- a/rebar.config
+++ b/rebar.config
@@ -10,7 +10,7 @@
 	{osmo_gsup, {git, "https://gerrit.osmocom.org/erlang/osmo_gsup", {branch, "osmocom/epdg"}}}
 ]}.
 
-{minimum_otp_vsn, "20.3"}.
+{minimum_otp_vsn, "25.2.3"}.
 {plugins, [
 	{rebar3_diameter_compiler,
 	  {git, "https://github.com/carlosedp/rebar3_diameter_compiler.git", {tag, "0.8.0"}}}

