Remove dev-python/dataclasses from SDK

dev-python/dataclasses is only used for Python 3.6
and it is included in 3.7+. After chroiumos rebase
the package fails to build. We don't need it anymore.

BUG=b/355647072,b/355647072
TEST=presubmit
RELEASE_NOTE=None

Change-Id: I9a844b8f138bc3d78794e391eb347e087439bf3c
Reviewed-on: https://cos-review.googlesource.com/c/third_party/overlays/chromiumos-overlay/+/77582
Reviewed-by: Sejal Sharma <sejalsharma@google.com>
Tested-by: Cusky Presubmit Bot <presubmit@cos-infra-prod.iam.gserviceaccount.com>
diff --git a/virtual/target-chromium-os-sdk/target-chromium-os-sdk-1-r317.ebuild b/virtual/target-chromium-os-sdk/target-chromium-os-sdk-1-r318.ebuild
similarity index 99%
rename from virtual/target-chromium-os-sdk/target-chromium-os-sdk-1-r317.ebuild
rename to virtual/target-chromium-os-sdk/target-chromium-os-sdk-1-r318.ebuild
index f69c430..cbcac3d 100644
--- a/virtual/target-chromium-os-sdk/target-chromium-os-sdk-1-r317.ebuild
+++ b/virtual/target-chromium-os-sdk/target-chromium-os-sdk-1-r318.ebuild
@@ -548,8 +548,8 @@
 # 	sys-libs/libnih"
 
 # Needed for cros-llvm.
-RDEPEND+="
-	dev-python/dataclasses"
+# RDEPEND+="
+# 	dev-python/dataclasses"
 
 # # Needed for app-metrics/node_exporter.
 # RDEPEND+="