add swift 6 1 thresholds (#171)

- **add thresholds for Swift 6.1 from 6.0 thresholds**

Author: rnro

Benchmarks/Thresholds/6.1/TracingBenchmarks.NoopTracing.attribute:_set,_span.attributes.http.status_code_=_200.p90.json

@@ -0,0 +1,3 @@
+{
+  "mallocCountTotal" : 2
+}

Benchmarks/Thresholds/6.1/TracingBenchmarks.NoopTracing.attribute:_set,_span.attributes['http.status_code']_=_200.p90.json

@@ -0,0 +1,3 @@
+{
+  "mallocCountTotal" : 1
+}

Benchmarks/Thresholds/6.1/TracingBenchmarks.NoopTracing.startSpan_endSpan.p90.json

@@ -0,0 +1,3 @@
+{
+  "mallocCountTotal" : 0
+}