Fix Julia 1.12 deprecation warning for Pipe constructor

This commit addresses issue #412 where Julia 1.12 triggers a warning
during precompilation about the Pipe constructor being extended without
explicit qualification.

The warning occurred because `@deprecate Pipe Tube` was ambiguous -
Julia couldn't determine if we were creating a new function or extending
`Base.Pipe`.

Fix: Added explicit `function Pipe end` declaration before the
deprecation to clearly indicate we're creating a new generic function,
not extending Base.Pipe.

Fixes #412

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: ChrisRackauckas

src/Hydraulic/IsothermalCompressible/components.jl

@@ -202,6 +202,7 @@ Constant length internal flow model discretized by `N` (`FixedVolume`: `N`, `Tub
 
     return System(eqs, t, vars, pars; name, systems = [ports; pipe_bases; volumes])
 end
+function Pipe end
 @deprecate Pipe Tube
 
 """