fix(deps): update module github.com/prometheus/prometheus to v0.308.1

| datasource | package                          | from                                   | to       |
| ---------- | -------------------------------- | -------------------------------------- | -------- |
| go         | github.com/prometheus/prometheus | v0.305.1-0.20250806170547-208187eaa19b | v0.308.1 |


Signed-off-by: renovate-sh-app[bot] <219655108+renovate-sh-app[bot]@users.noreply.github.com>

Author: renovate-sh-app[bot]

go.mod

@@ -17,7 +17,7 @@ require (
 	github.com/grafana/loki/v3 v3.6.3
 	github.com/grafana/regexp v0.0.0-20250905093917-f7b3be9d1853
 	github.com/prometheus/common v0.65.1-0.20250703115700-7f8b2a0d32d3
-	github.com/prometheus/prometheus v0.305.1-0.20250806170547-208187eaa19b
+	github.com/prometheus/prometheus v0.308.1
 	github.com/stretchr/testify v1.11.1
 )