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_blob.vim b/src/testdir/test_blob.vim
index 18d9c8a..47c09e7 100644
--- a/src/testdir/test_blob.vim
+++ b/src/testdir/test_blob.vim
@@ -324,5 +324,5 @@
 endfunc
 
 func Test_blob_sort()
-  call assert_fails('call sort([1.0, 0z11], "f")', 'E975:')
+  call assert_fails('call sort(["abc", 0z11], "f")', 'E702:')
 endfunc