chore(ci): pin `syn` to `2.0.106`

diff --git a/ci/pin-msrv.sh b/ci/pin-msrv.sh
index c9489b2e331dacfeb9fc357b445d4f88c5d555e6..d35a1ab1dd6ed8199638f855ab297bcc3a860d03 100755 (executable)
--- a/ci/pin-msrv.sh
+++ b/ci/pin-msrv.sh
@@ -33,3 +33,4 @@ cargo update -p rayon --precise "1.10.0"
 cargo update -p rayon-core --precise "1.12.1"
 cargo update -p socket2@0.6.1 --precise "0.5.10"
 cargo update -p quote --precise "1.0.41"
+cargo update -p syn --precise "2.0.106"