Fix juniper_rocket MSRV check by setting minimal version for pear transitive dependency instead of proc-macro2-diagnostics (#1152)

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Kai Ren <[email protected]>

Author: dependabot[bot]

juniper_rocket/Cargo.toml

@@ -27,7 +27,7 @@ serde_json = "1.0.18"
 # TODO: Try remove on upgrade of `rocket` crate.
 either = "1.8"
 inlinable_string = "0.1.15"
-proc-macro2-diagnostics = "0.9.1"
+pear = "0.2.4"
 tempfile = "3.3"
 
 [dev-dependencies]