MM-31436: Upgrade dependencies (#16605)

* MM-31436: Upgrade dependencies

Ran make update-dependencies

https://mattermost.atlassian.net/browse/MM-31436

```release-note
NONE
```

* add missing dep

* fix lru marshaling

vendor/github.com/klauspost/pgzip/.travis.yml

@@ -1,19 +1,22 @@
 language: go
 
-sudo: false
-
 os:
   - linux
   - osx
 
 go:
-  - 1.9.x
-  - 1.10.x
+  - 1.13.x
+  - 1.14.x
+  - 1.15.x
   - master
 
-script: 
- - go test -v -cpu=1,2,4 .
- - go test -v -cpu=2 -race -short .
+env:
+  - GO111MODULE=off
+
+script:
+  - diff <(gofmt -d .) <(printf "")
+  - go test -v -cpu=1,2,4 .
+  - go test -v -cpu=2 -race -short .
 
 matrix:
   allow_failures:

vendor/github.com/klauspost/pgzip/gunzip.go

@@ -331,6 +331,16 @@ func (z *Reader) killReadAhead() error {
 		// Wait for decompressor to be closed and return error, if any.
 		e, ok := <-z.closeErr
 		z.activeRA = false
+
+		for blk := range z.readAhead {
+			if blk.b != nil {
+				z.blockPool <- blk.b
+			}
+		}
+		if cap(z.current) > 0 {
+			z.blockPool <- z.current
+			z.current = nil
+		}
 		if !ok {
 			// Channel is closed, so if there was any error it has already been returned.
 			return nil
@@ -418,6 +428,7 @@ func (z *Reader) doReadAhead() {
 			case z.readAhead <- read{b: buf, err: err}:
 			case <-closeReader:
 				// Sent on close, we don't care about the next results
+				z.blockPool <- buf
 				return
 			}
 			if err != nil {