Remove taskchampion-sync-server (#3380)

This crate has been moved to
https://github.com/GothenburgBitFactory/taskchampion-sync-server.

The integration-tests repo used the sync server to test integration
between taskchampion and the sync-server. We should do that again, but
after taskchampion moves to its own repo (#3209). In the interim, the
cross-sync integration test can simply test syncing between local
servers, but the snapshot test is no longer useful as the local server
does not support snapshots.

taskchampion/integration-tests/Cargo.toml

@@ -7,18 +7,13 @@ publish = false
 build = "build.rs"
 
 [dependencies]
-taskchampion = { path = "../taskchampion", features = ["server-sync"] }
+taskchampion = { path = "../taskchampion" }
 taskchampion-lib = { path = "../lib" }
-taskchampion-sync-server = { path = "../sync-server" }
 
 [dev-dependencies]
 anyhow.workspace = true
-actix-web.workspace = true
-actix-rt.workspace = true
 tempfile.workspace = true
 pretty_assertions.workspace = true
-log.workspace = true
-env_logger.workspace = true
 lazy_static.workspace = true
 
 [build-dependencies]