Manual update of common-files (#2751)

Author: Eric Van Norman

common/.commonfiles.sha

@@ -1 +1 @@
-591260c501031c31225bde5b08f1b07d55649bec
+9d68fc5a210b4d2fc232be70470092c38df6fda8

common/Makefile.common.mk

@@ -102,7 +102,7 @@ update-common:
 	@if [ "$(CONTRIB_OVERRIDE)" != "CONTRIBUTING.md" ]; then\
 		rm $(TMP)/common-files/files/CONTRIBUTING.md;\
 	fi
-	@cp -a $(TMP)/common-files/files/* $(TMP)/common-files/files/.* $(shell pwd)
+	@cp -a $(TMP)/common-files/files/* $(TMP)/common-files/files/.devcontainer $(TMP)/common-files/files/.gitattributes $(shell pwd)
 	@rm -fr $(TMP)/common-files
 	@$(or $(COMMONFILES_POSTPROCESS), true)