patch 8.2.0183: tests fail when the float feature is disabled

Problem:    Tests fail when the float feature is disabled.
Solution:   Skip tests that don't work without float support.
diff --git a/src/testdir/test_lambda.vim b/src/testdir/test_lambda.vim
index c55de67..b8f11ea 100644
--- a/src/testdir/test_lambda.vim
+++ b/src/testdir/test_lambda.vim
@@ -216,7 +216,9 @@
 func Test_lambda_combination()
   call assert_equal(2, {x -> {x -> x}}(1)(2))
   call assert_equal(10, {y -> {x -> x(y)(10)}({y -> y})}({z -> z}))
-  call assert_equal(5.0, {x -> {y -> x / y}}(10)(2.0))
+  if has('float')
+    call assert_equal(5.0, {x -> {y -> x / y}}(10)(2.0))
+  endif
   call assert_equal(6, {x -> {y -> {z -> x + y + z}}}(1)(2)(3))
 
   call assert_equal(6, {x -> {f -> f(x)}}(3)({x -> x * 2}))