See bsc#1182548

- Update to 0.11.8:
Security:
* mod_saslauth: Disable ‘tls-unique’ channel binding with TLS 1.3 (#1542)
Fixes and improvements:
* net.websocket.frames: Improve websocket masking performance by using the new util.strbitop
* util.strbitop: Library for efficient bitwise operations on strings
Minor changes:
* MUC: Correctly advertise whether the subject can be changed (#1155)
* MUC: Preserve disco ‘node’ attribute (or lack thereof) in responses (#1595)
* MUC: Fix logic bug causing unnecessary presence to be sent (#1615)
* mod_bosh: Fix error if client tries to connect to component (#425)
* mod_bosh: Pick out the ‘wait’ before checking it instead of earlier
* mod_pep: Advertise base PubSub feature (#1632)
* mod_pubsub: Fix notification stanza type setting (#1605)
* mod_s2s: Prevent keepalives before client has established a stream
* net.adns: Fix bug that sent empty DNS packets (#1619)
* net.http.server: Don’t send Content-Length on 1xx/204 responses (#1596)
* net.websocket.frames: Fix length calculation bug (#1598)
* util.dbuffer: Make length API in line with Lua strings
* util.dbuffer: Optimize substring operations
* util.debug: Fix locals being reported under wrong stack frame in some cases
* util.dependencies: Fix check for Lua bitwise operations library (#1594)
* util.interpolation: Fix combination of filters and fallback values #1623
* util.promise: Preserve tracebacks
* util.stanza: Reject ASCII control characters (#1606)
* timers: Ensure timers can’t block other processing (#1620)

- Update to 0.11.7:
Security:
* mod_websocket: Enforce size limits on received frames (fixes #1593)