Bumping otel version to v0.18.0. Prepare for releasing v0.18.0

[Aneurysm9]

Fixed

• otelmemcache no longer sets span status to OK instead of leaving it unset. (otelmemcache: Simplify config and span status setting #477)
• Fix goroutine leak in gRPC StreamClientInterceptor (Fix goroutine leak in gRPC StreamClientInterceptor #581)

Removed

• Remove service name from otelmemcache configuration and span attributes. (otelmemcache: Simplify config and span status setting #477)

[codecov]

Codecov Report

Merging #600 (7219cbb) into main (f82555b) will decrease coverage by 0.0%.
The diff coverage is 83.4%.

@@           Coverage Diff           @@
##            main    #600     +/-   ##
=======================================
- Coverage   77.9%   77.9%   -0.1%     
=======================================
  Files         55      55             
  Lines       2602    2611      +9     
=======================================
+ Hits        2029    2035      +6     
- Misses       443     446      +3     
  Partials     130     130             

Impacted Files	Coverage Δ
detectors/gcp/gce.go	7.3% <0.0%> (ø)
detectors/gcp/gke.go	0.0% <0.0%> (ø)
...ion/github.com/Shopify/sarama/otelsarama/option.go	100.0% <ø> (ø)
...ation/github.com/astaxie/beego/otelbeego/common.go	100.0% <ø> (ø)
...ation/google.golang.org/grpc/otelgrpc/grpctrace.go	58.3% <40.0%> (-8.4%)	⬇️
instrumentation/net/http/otelhttp/handler.go	72.6% <75.0%> (ø)
...ion/google.golang.org/grpc/otelgrpc/interceptor.go	87.0% <87.5%> (ø)
exporters/metric/cortex/cortex.go	69.8% <94.4%> (ø)
detectors/aws/aws.go	84.6% <100.0%> (ø)
detectors/aws/ecs/ecs.go	53.8% <100.0%> (ø)
... and 20 more

[MrAlias]

🥇!