drop old waiters impl (#573)

Author: lucix-aws

codegen/smithy-go-codegen/src/main/java/software/amazon/smithy/go/codegen/SmithyGoDependency.java

@@ -80,11 +80,9 @@ public final class SmithyGoDependency {
     public static final GoDependency SMITHY_TRACING = smithy("tracing");
     public static final GoDependency SMITHY_METRICS = smithy("metrics");
 
-    public static final GoDependency GO_JMESPATH = goJmespath(null);
     public static final GoDependency MATH = stdlib("math");
 
     private static final String SMITHY_SOURCE_PATH = "github.com/aws/smithy-go";
-    private static final String GO_JMESPATH_SOURCE_PATH = "github.com/jmespath/go-jmespath";
 
     private SmithyGoDependency() {
     }
@@ -118,10 +116,6 @@ private static GoDependency smithy(String relativePath, String alias) {
         return relativePackage(SMITHY_SOURCE_PATH, relativePath, Versions.SMITHY_GO, alias);
     }
 
-    private static GoDependency goJmespath(String relativePath) {
-        return relativePackage(GO_JMESPATH_SOURCE_PATH, relativePath, Versions.GO_JMESPATH, "jmespath");
-    }
-
     private static GoDependency relativePackage(
             String moduleImportPath,
             String relativePath,