fix: Update module github.com/d0ugal/promexporter to v1.14.21

Author: renovate[bot]

go.mod

@@ -5,7 +5,7 @@ go 1.25
 toolchain go1.25.6
 
 require (
-	github.com/d0ugal/promexporter v1.14.20
+	github.com/d0ugal/promexporter v1.14.21
 	github.com/prometheus/client_golang v1.23.2
 	go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.64.0
 	go.opentelemetry.io/otel v1.39.0

go.sum

@@ -12,8 +12,8 @@ github.com/cespare/xxhash/v2 v2.3.0 h1:UL815xU9SqsFlibzuggzjXhog7bL6oX9BbNZnL2UF
 github.com/cespare/xxhash/v2 v2.3.0/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
 github.com/cloudwego/base64x v0.1.6 h1:t11wG9AECkCDk5fMSoxmufanudBtJ+/HemLstXDLI2M=
 github.com/cloudwego/base64x v0.1.6/go.mod h1:OFcloc187FXDaYHvrNIjxSe8ncn0OOM8gEHfghB2IPU=
-github.com/d0ugal/promexporter v1.14.20 h1:9AJ+nwghVevnTds52+ocT6sW38bR6xXUnzNYeJywEao=
-github.com/d0ugal/promexporter v1.14.20/go.mod h1:xv4TGrycEZXF5zzv7xYX1+q9Y3Y4zMPaM6YaUh8dQvk=
+github.com/d0ugal/promexporter v1.14.21 h1:3WghGJTp/QnilXo1xTFs48QdJMTKKmmNWVFz0mBs+FU=
+github.com/d0ugal/promexporter v1.14.21/go.mod h1:4q26rwR15LYui4hUkLNOAGT/uMVlgfBedA+jTaCyllk=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=