vendor: bump Pebble to 38b68e17aa97

Pebble commits:

```
38b68e17 internal/batchskl: return error on index overflow
8440f290 internal/manifest: use a line sweep to optimize NewL0Sublevels
0f5acb26 sstable: add direct block reading to suffix rewriter
26856d10 db: avoid stats flake in TestMemTableReservation
b452808f sstable: Make sstable Writer.Close idempotent
17fe1a65 sstable: add RewriteKeySuffixes function
c9e6edfc db: expose metrics on count and earliest seqnum of snapshots
b958d9a7 sstable: add a writeQueue to the sstable writer
c8dad06c db: disable automatic compactions in `MetricsTest`
015f5e38 internal/rangekey: fix range key iteration bug
```

The commit `38b68e17` contains the fix for #69906.

Closes #69906.

Release note: none

DEPS.bzl

@@ -1223,10 +1223,10 @@ def go_deps():
         patches = [
             "@cockroach//build/patches:com_github_cockroachdb_pebble.patch",
         ],
-        sha256 = "0018bcef357bf7bba06d5e3eb35277709b5fd98ee437924001531fa935d8c76d",
-        strip_prefix = "github.com/cockroachdb/[email protected]20220126162719-a5c1766b568a",
+        sha256 = "e411c1b5f5c7d2ef9dc337615de7b51051a182bba9c298f540d74d95d8a8f279",
+        strip_prefix = "github.com/cockroachdb/[email protected]20220201221612-38b68e17aa97",
         urls = [
-            "https://storage.googleapis.com/cockroach-godeps/gomod/github.com/cockroachdb/pebble/com_github_cockroachdb_pebble-v0.0.0-20220126162719-a5c1766b568a.zip",
+            "https://storage.googleapis.com/cockroach-godeps/gomod/github.com/cockroachdb/pebble/com_github_cockroachdb_pebble-v0.0.0-20220201221612-38b68e17aa97.zip",
         ],
     )
     go_repository(

go.mod

@@ -42,7 +42,7 @@ require (
 	github.com/cockroachdb/go-test-teamcity v0.0.0-20191211140407-cff980ad0a55
 	github.com/cockroachdb/gostdlib v1.13.0
 	github.com/cockroachdb/logtags v0.0.0-20211118104740-dabe8e521a4f
-	github.com/cockroachdb/pebble v0.0.0-20220126162719-a5c1766b568a
+	github.com/cockroachdb/pebble v0.0.0-20220201221612-38b68e17aa97
 	github.com/cockroachdb/redact v1.1.3
 	github.com/cockroachdb/returncheck v0.0.0-20200612231554-92cdbca611dd
 	github.com/cockroachdb/sentry-go v0.6.1-cockroachdb.2

go.sum

@@ -416,8 +416,8 @@ github.com/cockroachdb/logtags v0.0.0-20211118104740-dabe8e521a4f h1:6jduT9Hfc0n
 github.com/cockroachdb/logtags v0.0.0-20211118104740-dabe8e521a4f/go.mod h1:Vz9DsVWQQhf3vs21MhPMZpMGSht7O/2vFW2xusFUVOs=
 github.com/cockroachdb/panicparse/v2 v2.0.0-20211103220158-604c82a44f1e h1:FrERdkPlRj+v7fc+PGpey3GUiDGuTR5CsmLCA54YJ8I=
 github.com/cockroachdb/panicparse/v2 v2.0.0-20211103220158-604c82a44f1e/go.mod h1:pMxsKyCewnV3xPaFvvT9NfwvDTcIx2Xqg0qL5Gq0SjM=
-github.com/cockroachdb/pebble v0.0.0-20220126162719-a5c1766b568a h1:JY8MIjk2GyMHjCqmHkNBekLi2N/kNS3uAKheGe78huM=
-github.com/cockroachdb/pebble v0.0.0-20220126162719-a5c1766b568a/go.mod h1:buxOO9GBtOcq1DiXDpIPYrmxY020K2A8lOrwno5FetU=
+github.com/cockroachdb/pebble v0.0.0-20220201221612-38b68e17aa97 h1:zHSurQDtRibMUCQnJhUeV96D5tO8Vq9L39L/xr4BayI=
+github.com/cockroachdb/pebble v0.0.0-20220201221612-38b68e17aa97/go.mod h1:buxOO9GBtOcq1DiXDpIPYrmxY020K2A8lOrwno5FetU=
 github.com/cockroachdb/redact v1.0.8/go.mod h1:BVNblN9mBWFyMyqK1k3AAiSxhvhfK2oOZZ2lK+dpvRg=
 github.com/cockroachdb/redact v1.1.1/go.mod h1:BVNblN9mBWFyMyqK1k3AAiSxhvhfK2oOZZ2lK+dpvRg=
 github.com/cockroachdb/redact v1.1.3 h1:AKZds10rFSIj7qADf0g46UixK8NNLwWTNdCIGS5wfSQ=