Remove unnecessary exclude rule (open-telemetry#1766)

Signed-off-by: Bogdan Drutu <bogdandrutu@gmail.com>

Author: bogdandrutu

.golangci.yml

@@ -118,11 +118,6 @@ issues:
     - path: opencensus_test.go
       linters:
         - unused
-    # Exclude some staticcheck messages
-    - linters:
-      - staticcheck
-      # See https://github.com/golang/protobuf/issues/1077
-      text: "SA1019:"
     - path: receiver/otlpreceiver/marshal_jsonpb\.go
       linters:
         - gocritic