[monitoring-plugins] Use debian stable for main tests again

[RincewindsHat]

 Module: monitoring-plugins
 Branch: master
 Commit: 158555c1a98801795991c94a2937eeaeb74a389a
 Author: RincewindsHat <12514511+RincewindsHat at users.noreply.github.com>
   Date: Fri Dec 22 11:41:41 2023 +0100
    URL: https://www.monitoring-plugins.org/repositories/monitoring-plugins/commit/?id=158555c

Use debian stable for main tests again

---

 .github/workflows/test.yml | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 9297a75..c4975f1 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -49,10 +49,10 @@ jobs:
       fail-fast: false
       matrix:
         distro:
-          - 'debian:testing'
+          - 'debian:stable'
           #...
         include:
-          - distro: 'debian:testing'
+          - distro: 'debian:stable'
             prepare: .github/prepare_debian.sh
           #...
     steps: