go.mod: bump client-go and api machinerie

I had to run `make generate`.
Some API functions got additional parameters `Options` and `Context`.
I used empty options and `context.TODO()` for now.

Signed-off-by: leonnicolas <leonloechner@gmx.de>

vendor/github.com/cespare/xxhash/v2/.travis.yml

@@ -0,0 +1,8 @@
+language: go
+go:
+  - "1.x"
+  - master
+env:
+  - TAGS=""
+  - TAGS="-tags purego"
+script: go test $TAGS -v ./...