Remove unused sync'ed files

Author: kzu

.github/workflows/combine-prs.yml

@@ -113,14 +113,10 @@
 	weak
 [file ".github/workflows/combine-prs.yml"]
 	url = https://github.com/devlooped/oss/blob/main/.github/workflows/combine-prs.yml
-	sha = c1610886eba42cb250e3894aed40c0a258cd383d
-	etag = 598ee294649a44d4c5d5934416c01183597d08aa7db7938453fd2bbf52a4e64d
-	weak
+	skip
 [file ".github/workflows/dotnet-file-core.yml"]
 	url = https://github.com/devlooped/oss/blob/main/.github/workflows/dotnet-file-core.yml
-	sha = 875284ba5d565f529aba2f5d24ab8ed27c1d1c79
-	etag = 8de1d974bf73b1945b5c8be684c3a0b7364114a0d795c9d68837aed9b3aff331
-	weak
+	skip
 [file ".github/workflows/triage.yml"]
 	url = https://github.com/devlooped/oss/blob/main/.github/workflows/triage.yml
 	sha = 33000c0c4ab4eb4e0e142fa54515b811a189d55c