Bump dotnet

Author: ansd

.github/workflows/test-make-target.yaml

@@ -45,7 +45,7 @@ jobs:
       uses: actions/setup-dotnet@v4
       if: inputs.plugin == 'rabbit'
       with:
-        dotnet-version: '3.1.x'
+        dotnet-version: '8.0'
 
     - name: SETUP SLAPD (rabbitmq_auth_backend_ldap)
       if: inputs.plugin == 'rabbitmq_auth_backend_ldap'

deps/rabbit/test/amqp_system_SUITE_data/fsharp-tests/global.json

@@ -1,5 +1,5 @@
 {
   "sdk": {
-    "version": "3.1"
+    "version": "8.0"
   }
 }