change getMethodName to getKernelMethod in other files

ruby/ql/lib/codeql/ruby/frameworks/core/internal/IOOrFile.qll

@@ -29,7 +29,7 @@ DataFlow::Node fileInstanceInstantiation() {
   result = API::getTopLevelMember("File").getAMethodCall(["open", "try_convert"])
   or
   // Calls to `Kernel.open` can yield `File` instances
-  result.(KernelMethodCall).getMethodName() = "open" and
+  result.(KernelMethodCall).getKernelMethod() = "open" and
   // Assume that calls that don't invoke shell commands will instead open
   // a file.
   not pathArgSpawnsSubprocess(result.(KernelMethodCall).getArgument(0).asExpr().getExpr())

ruby/ql/lib/codeql/ruby/security/KernelOpenQuery.qll

@@ -13,7 +13,7 @@ class AmbiguousPathCall extends DataFlow::CallNode {
   string name;
 
   AmbiguousPathCall() {
-    this.(KernelMethodCall).getMethodName() = "open" and
+    this.(KernelMethodCall).getKernelMethod() = "open" and
     name = "Kernel.open"
     or
     this = API::getTopLevelMember("IO").getAMethodCall("read") and

ruby/ql/lib/codeql/ruby/security/StackTraceExposureCustomizations.qll

@@ -41,8 +41,8 @@ module StackTraceExposure {
   /**
    * A call to `Kernel#caller`, considered as a flow source.
    */
-  class KernelCallerCall extends Source, Kernel::KernelMethodCall {
-    KernelCallerCall() { this.getMethodName() = "caller" }
+  class KernelCallerCall extends Source instanceof Kernel::KernelMethodCall {
+    KernelCallerCall() { super.getKernelMethod() = "caller" }
   }
 
   /**