Fix incorrect use of syn::exports (#7838)

* Fix incorrect use of syn::exports

Instead of using `syn::exports` we should import the trait from the
quote crate directly.

* Use own macro for test cases to fix compilation with latest syn

* Fix test

substrate/Cargo.lock

@@ -6940,6 +6940,7 @@ dependencies = [
  "parity-scale-codec",
  "parity-wasm 0.41.0",
  "parking_lot 0.11.1",
+ "paste 0.1.18",
  "sc-executor-common",
  "sc-executor-wasmi",
  "sc-executor-wasmtime",
@@ -6960,7 +6961,6 @@ dependencies = [
  "sp-version",
  "sp-wasm-interface",
  "substrate-test-runtime",
- "test-case",
  "tracing",
  "tracing-subscriber",
  "wasmi",
@@ -9194,9 +9194,9 @@ checksum = "343f3f510c2915908f155e94f17220b19ccfacf2a64a2a5d8004f2c3e311e7fd"
 
 [[package]]
 name = "syn"
-version = "1.0.48"
+version = "1.0.58"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cc371affeffc477f42a221a1e4297aedcea33d47d19b61455588bd9d8f6b19ac"
+checksum = "cc60a3d73ea6594cd712d830cc1f0390fd71542d8c8cd24e70cc54cdfd5e05d5"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -9250,19 +9250,6 @@ dependencies = [
  "winapi-util",
 ]
 
-[[package]]
-name = "test-case"
-version = "0.3.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a605baa797821796a751f4a959e1206079b24a4b7e1ed302b7d785d81a9276c9"
-dependencies = [
- "lazy_static",
- "proc-macro2",
- "quote",
- "syn",
- "version_check",
-]
-
 [[package]]
 name = "textwrap"
 version = "0.11.0"