instrumentation/net/http/otelhttp: upgrade semconv to v1.26.0 (open-telemetry#5923)

Bases on the discussion in open-telemetry#5902 , we have came to the conclusion that
there's no new stable attributes introduced in semconv v1.26.0 for
otelhttp. We can directly bump from v1.24.0 to v1.26.0

Changes in this PR:
- bump semconv from v1.24.0 to v1.26.0 for otelhttp
- rename the
`instrumentation/net/http/otelhttp/internal/semconv/v1.24.0.go` to
`instrumentation/net/http/otelhttp/internal/semconv/httpconv.go` to
match with client side naming convention

---------

Co-authored-by: Damien Mathieu <[email protected]>

Author: 2 people

CHANGELOG.md

@@ -17,7 +17,7 @@ This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.htm
   This module provides an OpenTelemetry logging bridge for `go.uber.org/zap`. (#5191)
 - The `go.opentelemetry.io/contrib/config` package supports configuring `with_resource_constant_labels` for the prometheus exporter. (#5890)
 - Add new runtime metrics to `go.opentelemetry.io/contrib/instrumentation/runtime`, which are still disabled by default. (#5870)
-- Support for the `OTEL_HTTP_CLIENT_COMPATIBILITY_MODE=http/dup` environment variable in `go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp` to emit attributes for both the v1.20.0 and v1.24.0 semantic conventions. (#5401)
+- Support for the `OTEL_HTTP_CLIENT_COMPATIBILITY_MODE=http/dup` environment variable in `go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp` to emit attributes for both the v1.20.0 and v1.26.0 semantic conventions. (#5401)
 
 ### Removed
 

instrumentation/net/http/otelhttp/internal/semconv/v1.24.0.go renamed to instrumentation/net/http/otelhttp/internal/semconv/httpconv.go

@@ -8,7 +8,7 @@ import (
 	"strings"
 
 	"go.opentelemetry.io/otel/attribute"
-	semconvNew "go.opentelemetry.io/otel/semconv/v1.24.0"
+	semconvNew "go.opentelemetry.io/otel/semconv/v1.26.0"
 )
 
 type newHTTPServer struct{}

instrumentation/net/http/otelhttp/internal/semconv/v1.24.0_test.go renamed to instrumentation/net/http/otelhttp/internal/semconv/httpconv_test.go

@@ -10,7 +10,7 @@ import (
 	"strings"
 
 	"go.opentelemetry.io/otel/attribute"
-	semconvNew "go.opentelemetry.io/otel/semconv/v1.24.0"
+	semconvNew "go.opentelemetry.io/otel/semconv/v1.26.0"
 )
 
 // splitHostPort splits a network address hostport of the form "host",