Bump github.com/sagernet/sing from 0.2.14 to 0.2.15

Bumps [github.com/sagernet/sing](https://github.com/sagernet/sing) from 0.2.14 to 0.2.15.
- [Commits](https://github.com/sagernet/sing/compare/v0.2.14...v0.2.15)

---
updated-dependencies:
- dependency-name: github.com/sagernet/sing
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

go.mod

@@ -12,7 +12,7 @@ require (
 	github.com/pires/go-proxyproto v0.7.0
 	github.com/quic-go/quic-go v0.39.2
 	github.com/refraction-networking/utls v1.5.4
-	github.com/sagernet/sing v0.2.14
+	github.com/sagernet/sing v0.2.15
 	github.com/sagernet/sing-shadowsocks v0.2.5
 	github.com/sagernet/wireguard-go v0.0.0-20221116151939-c99467f53f2c
 	github.com/seiflotfy/cuckoofilter v0.0.0-20220411075957-e3b120b3f5fb

go.sum

@@ -125,8 +125,8 @@ github.com/refraction-networking/utls v1.5.4/go.mod h1:SPuDbBmgLGp8s+HLNc83Fuavw
 github.com/riobard/go-bloom v0.0.0-20200614022211-cdc8013cb5b3 h1:f/FNXud6gA3MNr8meMVVGxhp+QBTqY91tM8HjEuMjGg=
 github.com/riobard/go-bloom v0.0.0-20200614022211-cdc8013cb5b3/go.mod h1:HgjTstvQsPGkxUsCd2KWxErBblirPizecHcpD3ffK+s=
 github.com/russross/blackfriday v1.5.2/go.mod h1:JO/DiYxRf+HjHt06OyowR9PTA263kcR/rfWxYHBV53g=
-github.com/sagernet/sing v0.2.14 h1:L3AXDh22nsOOYz2nTRU1JvpRsmzViWKI1B8TsQYG1eY=
-github.com/sagernet/sing v0.2.14/go.mod h1:AhNEHu0GXrpqkuzvTwvC8+j2cQUU/dh+zLEmq4C99pg=
+github.com/sagernet/sing v0.2.15 h1:PFwyiMzkyJkq+YGOVznJUsRVOT6EoVxRGIsllLuvHXA=
+github.com/sagernet/sing v0.2.15/go.mod h1:AhNEHu0GXrpqkuzvTwvC8+j2cQUU/dh+zLEmq4C99pg=
 github.com/sagernet/sing-shadowsocks v0.2.5 h1:qxIttos4xu6ii7MTVJYA8EFQR7Q3KG6xMqmLJIFtBaY=
 github.com/sagernet/sing-shadowsocks v0.2.5/go.mod h1:MGWGkcU2xW2G2mfArT9/QqpVLOGU+dBaahZCtPHdt7A=
 github.com/sagernet/wireguard-go v0.0.0-20221116151939-c99467f53f2c h1:vK2wyt9aWYHHvNLWniwijBu/n4pySypiKRhN32u/JGo=