Fix non-constant format string errors with Go 1.24

pkg/dsl/cst/builtin_functions.go

@@ -5,6 +5,7 @@
 package cst
 
 import (
+	"errors"
 	"fmt"
 
 	"github.com/johnkerl/miller/v6/pkg/bifs"
@@ -78,7 +79,7 @@ func (root *RootNode) BuildMultipleArityFunctionCallsiteNode(
 		return root.BuildTernaryFunctionCallsiteNode(astNode, builtinFunctionInfo)
 	}
 
-	return nil, fmt.Errorf(
+	return nil, errors.New(
 		"at CST BuildMultipleArityFunctionCallsiteNode: function name not found: " +
 			builtinFunctionInfo.name,
 	)

pkg/dsl/cst/lvalues.go

@@ -6,6 +6,7 @@
 package cst
 
 import (
+	"errors"
 	"fmt"
 	"os"
 
@@ -62,7 +63,7 @@ func (root *RootNode) BuildAssignableNode(
 		return root.BuildEnvironmentVariableLvalueNode(astNode)
 	}
 
-	return nil, fmt.Errorf(
+	return nil, errors.New(
 		"at CST BuildAssignableNode: unhandled AST node " + string(astNode.Type),
 	)
 }

pkg/dsl/cst/root.go

@@ -7,6 +7,7 @@ package cst
 
 import (
 	"container/list"
+	"errors"
 	"fmt"
 	"os"
 	"strings"
@@ -163,7 +164,7 @@ func (root *RootNode) IngestAST(
 	err = nil
 
 	if ast.RootNode == nil {
-		return hadWarnings, fmt.Errorf("cannot build CST from nil AST root")
+		return hadWarnings, errors.New("cannot build CST from nil AST root")
 	}
 
 	// Check for things that are syntax errors but not done in the AST for
@@ -417,7 +418,7 @@ func (root *RootNode) resolveSubroutineCallsites() error {
 			return err
 		}
 		if uds == nil {
-			return fmt.Errorf("mlr: subroutine name not found: " + subroutineName)
+			return errors.New("mlr: subroutine name not found: " + subroutineName)
 		}
 
 		unresolvedSubroutineCallsite.uds = uds