add missing deprecations for .//, .>>, .<< (#19683)

Author: stevengj

base/deprecated.jl

@@ -1005,7 +1005,7 @@ export @vectorize_1arg, @vectorize_2arg
 
 # deprecations for uses of old dot operators (.* etc) as objects, rather than
 # just calling them infix.
-for op in (:(!=), :≠, :+, :-, :*, :/, :÷, :%, :<, :(<=), :≤, :(==), :>, :>=, :≥, :\, :^)
+for op in (:(!=), :≠, :+, :-, :*, :/, :÷, :%, :<, :(<=), :≤, :(==), :>, :>=, :≥, :\, :^, ://, :>>, :<<)
     dotop = Symbol('.', op)
     # define as const dotop = (a,b) -> ...
     # to work around syntax deprecation for dotop(a,b) = ...

base/exports.jl

@@ -215,7 +215,6 @@ export
     -,
     /,
     //,
-    .//,
     <,
     <:,
     <<,
@@ -226,8 +225,6 @@ export
     >=,
     ≥,
     >>,
-    .>>,
-    .<<,
     >>>,
     \,
     ^,