ci, go.mod: bump to go 1.23 (#1094)

* ci, go.mod: bump to go 1.23

Now that go.mod matches our go version, we can stop setting go version
in CI separately.

Signed-off-by: Casey Callendrello <c1@caseyc.net>

* minor: fix lint errors

Bumping golangci-lint to v1.61 introduced some new reasonable checks;
fix the errors they found.

Signed-off-by: Casey Callendrello <c1@caseyc.net>

* ci: bump golangci-lint to v1.61.0

Also, fix some deprecated config directives.

Signed-off-by: Casey Callendrello <c1@caseyc.net>

---------

Signed-off-by: Casey Callendrello <c1@caseyc.net>

pkg/errors/errors_test.go

@@ -43,7 +43,7 @@ func TestAnnotate(t *testing.T) {
 
 	for _, test := range tests {
 		t.Run(test.name, func(t *testing.T) {
-			if !reflect.DeepEqual(Annotatef(test.existingErr, test.contextMessage), test.expectedErr) {
+			if !reflect.DeepEqual(Annotate(test.existingErr, test.contextMessage), test.expectedErr) {
 				t.Errorf("test case %s fails", test.name)
 				return
 			}