rebase: bump golang.org/x/crypto from 0.5.0 to 0.6.0

Bumps [golang.org/x/crypto](https://github.com/golang/crypto) from 0.5.0 to 0.6.0.
- [Release notes](https://github.com/golang/crypto/releases)
- [Commits](https://github.com/golang/crypto/compare/v0.5.0...v0.6.0)

---
updated-dependencies:
- dependency-name: golang.org/x/crypto
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

vendor/golang.org/x/net/http2/flow.go

@@ -18,7 +18,7 @@ type inflow struct {
 	unsent int32
 }
 
-// set sets the initial window.
+// init sets the initial window.
 func (f *inflow) init(n int32) {
 	f.avail = n
 }

vendor/golang.org/x/net/http2/hpack/hpack.go

@@ -211,7 +211,7 @@ func (d *Decoder) at(i uint64) (hf HeaderField, ok bool) {
 	return dt.ents[dt.len()-(int(i)-staticTable.len())], true
 }
 
-// Decode decodes an entire block.
+// DecodeFull decodes an entire block.
 //
 // TODO: remove this method and make it incremental later? This is
 // easier for debugging now.

vendor/golang.org/x/net/http2/server.go

@@ -2192,7 +2192,7 @@ func (sc *serverConn) newWriterAndRequestNoBody(st *stream, rp requestParam) (*r
 		tlsState = sc.tlsState
 	}
 
-	needsContinue := rp.header.Get("Expect") == "100-continue"
+	needsContinue := httpguts.HeaderValuesContainsToken(rp.header["Expect"], "100-continue")
 	if needsContinue {
 		rp.header.Del("Expect")
 	}

vendor/golang.org/x/net/http2/transport.go

@@ -1569,7 +1569,7 @@ func (cs *clientStream) cleanupWriteRequest(err error) {
 	close(cs.donec)
 }
 
-// awaitOpenSlotForStream waits until len(streams) < maxConcurrentStreams.
+// awaitOpenSlotForStreamLocked waits until len(streams) < maxConcurrentStreams.
 // Must hold cc.mu.
 func (cc *ClientConn) awaitOpenSlotForStreamLocked(cs *clientStream) error {
 	for {