Update usage of shape crate for 0.7.0-preview.1+ releases.

We are updating the `shape` crate before introducing any abstract
types-related changes, because this update benefits all connect spec
versions, while still allowing us to preserve backwards/forwards
compatibility for older versions (connect/v0.3 and earlier). It would be
a shame to have to maintain two slightly different `shape` APIs (hogging
the same cargo package name) in order to keep connect/v0.3 and earlier
working as before.

One of the goals of this commit is to show how limited/reasonable the
updates are, because the new functionality coming in [email protected] does
not radically alter the behavior of the library (at least not in the
ways we were previously using it).

Some notable (expected) changes: we've started using a
`shape.locations()` method instead of accessing/mutating the
`shape.locations` vector directly, the new shape name tracking system
allows better error messages, and shape pretty-printing may now include
newlines for readability.

Author: benjamn

Cargo.lock

@@ -6299,9 +6299,9 @@ dependencies = [
 
 [[package]]
 name = "shape"
-version = "0.6.0"
+version = "0.7.0-preview.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "48f06e8e6e2486e2ca1fc86254acb38bca0cd7da30af443e8d63958c66738f88"
+checksum = "3d8a224fea1e1bd0e3c2739db60235cd3704ccedab58fd9214d315e345d4779a"
 dependencies = [
  "apollo-compiler",
  "indexmap 2.12.1",

apollo-federation/Cargo.toml

@@ -52,7 +52,7 @@ url = "2"
 either = "1.13.0"
 tracing = "0.1.40"
 ron = { version = "0.12.0", optional = true }
-shape = "0.6.0"
+shape = { version = "=0.7.0-preview.1" }
 form_urlencoded = "1.2.1"
 parking_lot = "0.12.4"
 mime = "0.3.17"