Adapt req.txt for arraycontext

requirements.txt

@@ -13,10 +13,5 @@ git+https://github.com/inducer/pymbolic.git#egg=pymbolic
 # also depends on pymbolic, so should come after it
 git+https://github.com/inducer/loopy.git#egg=loopy
 
-# more pytential dependencies
-git+https://github.com/inducer/boxtree.git#egg=boxtree
-git+https://github.com/inducer/sumpy.git#egg=sumpy
-git+https://github.com/inducer/pytential.git#egg=pytential
-
 # requires pymetis for tests for partition_mesh
-git+https://github.com/inducer/pymetis.git#egg=pymetis
+git+https://github.com/inducer/pytato.git#egg=pytato