Bump github.com/moznion/go-optional from 0.5.0 to 0.8.0

Bumps [github.com/moznion/go-optional](https://github.com/moznion/go-optional) from 0.5.0 to 0.8.0.
- [Release notes](https://github.com/moznion/go-optional/releases)
- [Commits](moznion/go-optional@v0.5.0...v0.8.0)

---
updated-dependencies:
- dependency-name: github.com/moznion/go-optional
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

go.mod

@@ -16,7 +16,7 @@ require (
 	github.com/mailru/easyjson v0.7.7 // indirect
 	github.com/mattn/go-isatty v0.0.14 // indirect
 	github.com/mattn/go-sqlite3 v1.14.16 // indirect
-	github.com/moznion/go-optional v0.5.0
+	github.com/moznion/go-optional v0.8.0
 	github.com/stretchr/testify v1.8.1
 	github.com/swaggo/echo-swagger v1.3.5
 	github.com/swaggo/swag v1.8.7

go.sum

@@ -153,8 +153,8 @@ github.com/mattn/go-isatty v0.0.14/go.mod h1:7GGIvUiUoEMVVmxf/4nioHXj79iQHKdU27k
 github.com/mattn/go-sqlite3 v1.14.15/go.mod h1:2eHXhiwb8IkHr+BDWZGa96P6+rkvnG63S2DGjv9HUNg=
 github.com/mattn/go-sqlite3 v1.14.16 h1:yOQRA0RpS5PFz/oikGwBEqvAWhWg5ufRz4ETLjwpU1Y=
 github.com/mattn/go-sqlite3 v1.14.16/go.mod h1:2eHXhiwb8IkHr+BDWZGa96P6+rkvnG63S2DGjv9HUNg=
-github.com/moznion/go-optional v0.5.0 h1:BGfkHyvSbdfGP4F7x7ywxg6wltAagG/BGOXoEyBTBlQ=
-github.com/moznion/go-optional v0.5.0/go.mod h1:lTyBRKsQPhzFQZb5M+v4cCOYLuD9JUgP0izTOjR8lsw=
+github.com/moznion/go-optional v0.8.0 h1:jkjjjGQOuUNo6cRY2RNdvIfQF+QoV/K45zlEBA8XU0g=
+github.com/moznion/go-optional v0.8.0/go.mod h1:l3mLmsyp2bWTvWKjEm5MT7lo3g5MRlNIflxFB0XTASA=
 github.com/niemeyer/pretty v0.0.0-20200227124842-a10e7caefd8e h1:fD57ERR4JtEqsWbfPhv4DMiApHyliiK5xCTNVSPiaAs=
 github.com/niemeyer/pretty v0.0.0-20200227124842-a10e7caefd8e/go.mod h1:zD1mROLANZcx1PVRCS0qkT7pwLkGfwJo4zjcN/Tysno=
 github.com/otiai10/copy v1.7.0/go.mod h1:rmRl6QPdJj6EiUqXQ/4Nn2lLXoNQjFCQbbNrxgc/t3U=