Fixes

• Use the proper dependency version of go.opentelemetry.io/otel/sdk/log/logtest in go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploggrpc. (#6800)
• Use the proper dependency version of go.opentelemetry.io/otel/sdk/log/logtest in go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploghttp. (#6800)
• Use the proper dependency version of go.opentelemetry.io/otel/sdk/log/logtest in go.opentelemetry.io/otel/exporters/stdout/stdoutlog. (#6800)