Upgrade raft to v1.1.6 to fix panic on log compaction (#7811)

Fixes #7810

The raft library would panic when prevLogIndex was beyond the end of
the log after compaction. The fix in raft v1.1.6 returns nil instead,
triggering the snapshot fallback mechanism.

go.mod

@@ -71,7 +71,7 @@ require (
 	github.com/rcrowley/go-metrics v0.0.0-20201227073835-cf1acfcdf475 // indirect
 	github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec // indirect
 	github.com/seaweedfs/goexif v1.0.3
-	github.com/seaweedfs/raft v1.1.3
+	github.com/seaweedfs/raft v1.1.6
 	github.com/sirupsen/logrus v1.9.3 // indirect
 	github.com/spf13/afero v1.15.0 // indirect
 	github.com/spf13/cast v1.10.0 // indirect

go.sum

@@ -1618,8 +1618,8 @@ github.com/seaweedfs/cockroachdb-parser v0.0.0-20251021184156-909763b17138 h1:bX
 github.com/seaweedfs/cockroachdb-parser v0.0.0-20251021184156-909763b17138/go.mod h1:JSKCh6uCHBz91lQYFYHCyTrSVIPge4SUFVn28iwMNB0=
 github.com/seaweedfs/goexif v1.0.3 h1:ve/OjI7dxPW8X9YQsv3JuVMaxEyF9Rvfd04ouL+Bz30=
 github.com/seaweedfs/goexif v1.0.3/go.mod h1:Oni780Z236sXpIQzk1XoJlTwqrJ02smEin9zQeff7Fk=
-github.com/seaweedfs/raft v1.1.3 h1:5B6hgneQ7IuU4Ceom/f6QUt8pEeqjcsRo+IxlyPZCws=
-github.com/seaweedfs/raft v1.1.3/go.mod h1:9cYlEBA+djJbnf/5tWsCybtbL7ICYpi+Uxcg3MxjuNs=
+github.com/seaweedfs/raft v1.1.6 h1:e83Xn0boscPnuSiBllUPeWRVS6JKrqJPYBozgFyBiC0=
+github.com/seaweedfs/raft v1.1.6/go.mod h1:9cYlEBA+djJbnf/5tWsCybtbL7ICYpi+Uxcg3MxjuNs=
 github.com/sergi/go-diff v1.0.0/go.mod h1:0CfEIISq7TuYL3j771MWULgwwjU+GofnZX9QAmXWZgo=
 github.com/sergi/go-diff v1.1.0/go.mod h1:STckp+ISIX8hZLjrqAeVduY0gWCT9IjLuqbuNXdaHfM=
 github.com/sergi/go-diff v1.2.0 h1:XU+rvMAioB0UC3q1MFrIQy4Vo5/4VsRDQQXHsEya6xQ=