Bump dotnet from v1.6.0 to v1.7.0 in helm-charts/splunk-otel-collector/values.yaml

[github-actions]

Use the latest version of dotnet

[atoulme]

=== RUN   Test_Functions/.NET_traces_captured
    functional_test.go:744: 
        	Error Trace:	/home/runner/work/splunk-otel-collector-chart/splunk-otel-collector-chart/functional_tests/functional_test.go:744
        	Error:      	Received unexpected error:
        	            	the following errors occurred:
        	            	 -  missing expected resource: map[cluster_name:ci-k8s-cluster container.image.name:quay.io/splunko11ytest/dotnet_test container.image.tag:latest customfield1:customvalue1 customfield2:customvalue2 deployment.environment:dev host.name:kind-control-plane k8s.cluster.name:dev-operator k8s.container.name:dotnet-test k8s.namespace.name:default k8s.node.name:kind-control-plane k8s.pod.labels.app:dotnet-test os.type:linux process.owner:root process.runtime.description:.NET 8.0.3 process.runtime.name:.NET process.runtime.version:8.0.3 service.name:dotnet-test service.version:latest telemetry.distro.name:splunk-otel-dotnet telemetry.sdk.language:dotnet telemetry.sdk.name:opentelemetry]
        	            	 -  unexpected resource: map[cluster_name:ci-k8s-cluster container.image.name:quay.io/splunko11ytest/dotnet_test container.image.tag:latest customfield1:customvalue1 customfield2:customvalue2 deployment.environment:dev host.name:kind-control-plane k8s.cluster.name:dev-operator k8s.container.name:dotnet-test k8s.namespace.name:default k8s.node.name:kind-control-plane k8s.pod.labels.app:dotnet-test os.build_id:6.8.0-1014-azure os.name:Alpine Linux os.type:linux process.owner:root process.runtime.description:.NET 8.0.3 process.runtime.name:.NET process.runtime.version:8.0.3 service.name:dotnet-test service.version:latest telemetry.distro.name:splunk-otel-dotnet telemetry.sdk.language:dotnet telemetry.sdk.name:opentelemetry]
        	Test:       	Test_Functions/.NET_traces_captured

[atoulme]

The new .NET SDK adds 2 new resource attributes: os.build_id:6.8.0-1014-azure and os.name:Alpine Linux