Update prometheus-alertmanager (#348)

Author: alexander-akhmetov

go.mod

@@ -109,7 +109,7 @@ require (
 )
 
 // Using a fork of the Alertmanager with Alerting Squad specific changes.
-replace github.com/prometheus/alertmanager => github.com/grafana/prometheus-alertmanager v0.25.1-0.20250604130045-92c8f6389b36
+replace github.com/prometheus/alertmanager => github.com/grafana/prometheus-alertmanager v0.25.1-0.20250620093340-be61a673dee6
 
 replace github.com/Unknwon/com v1.0.1 => github.com/unknwon/com v1.0.1
 

go.sum

@@ -284,8 +284,8 @@ github.com/googleapis/gax-go/v2 v2.2.0/go.mod h1:as02EH8zWkzwUoLbBaFeQ+arQaj/Oth
 github.com/googleapis/gax-go/v2 v2.3.0/go.mod h1:b8LNqSzNabLiUpXKkY7HAR5jr6bIT99EXz9pXxye9YM=
 github.com/googleapis/gax-go/v2 v2.4.0/go.mod h1:XOTVJ59hdnfJLIP/dh8n5CGryZR2LxK9wbMD5+iXC6c=
 github.com/googleapis/google-cloud-go-testing v0.0.0-20200911160855-bcd43fbb19e8/go.mod h1:dvDLG8qkwmyD9a/MJJN3XJcT3xFxOKAvTZGvuZmac9g=
-github.com/grafana/prometheus-alertmanager v0.25.1-0.20250604130045-92c8f6389b36 h1:AjZ58JRw1ZieFH/SdsddF5BXtsDKt5kSrKNPWrzYz3Y=
-github.com/grafana/prometheus-alertmanager v0.25.1-0.20250604130045-92c8f6389b36/go.mod h1:O/QP1BCm0HHIzbKvgMzqb5sSyH88rzkFk84F4TfJjBU=
+github.com/grafana/prometheus-alertmanager v0.25.1-0.20250620093340-be61a673dee6 h1:oJnbhG6ZNy10AjsgNeAtAKeGHogIGOMfAsBH6fYYa5M=
+github.com/grafana/prometheus-alertmanager v0.25.1-0.20250620093340-be61a673dee6/go.mod h1:O/QP1BCm0HHIzbKvgMzqb5sSyH88rzkFk84F4TfJjBU=
 github.com/grpc-ecosystem/go-grpc-prometheus v1.2.0/go.mod h1:8NvIoxWQoOIhqOTXgfV/d3M/q6VIi02HzZEHgUlZvzk=
 github.com/grpc-ecosystem/grpc-gateway v1.16.0/go.mod h1:BDjrQk3hbvj6Nolgz8mAMFbcEtjT1g+wF4CSlocrBnw=
 github.com/hashicorp/consul/api v1.12.0/go.mod h1:6pVBMo0ebnYdt2S3H87XhekM/HHrUoTD2XXb/VrZVy0=