Update module go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp to v0.68.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp	v0.65.0 → v0.68.0

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[renovate]

ℹ️ Artifact update notice

File name: go.mod

In order to perform the update(s) described in the table above, Renovate ran the go get command, which resulted in the following additional change(s):

• 6 additional dependencies were updated

Details:

Package	Change
go.opentelemetry.io/otel	v1.40.0 -> v1.43.0
go.opentelemetry.io/otel/sdk	v1.40.0 -> v1.43.0
go.opentelemetry.io/otel/sdk/metric	v1.40.0 -> v1.43.0
go.opentelemetry.io/otel/metric	v1.40.0 -> v1.43.0
go.opentelemetry.io/otel/trace	v1.40.0 -> v1.43.0
golang.org/x/sys	v0.40.0 -> v0.42.0