Tabulate 0.9 breaks Snakemake

See details in [snakemake issue 1899](snakemake/snakemake#1899):

tabulate 0.9 reproducibly crashes snakemake with an error:
```text
AttributeError: 'str' object has no attribute 'name'
```

recipes/snakemake/meta.yaml

@@ -9,7 +9,7 @@ source:
   sha256: 8d5bc68dc8e1a747f107b72052865b740f96cbafa53250de63e95f3f1a91a0b8
 
 build:
-  number: 0
+  number: 1
   noarch: generic
 
 requirements:
@@ -105,7 +105,7 @@ outputs:
         - smart_open >=3.0
         - filelock
         - stopit
-        - tabulate
+        - tabulate <0.9
         - jinja2 >=3.0,<4.0
         - yte >=1.2,<2.0
         - reretry