[chore]: Bump github.com/gin-contrib/sessions from 1.0.2 to 1.0.3 (#4033)

Bumps [github.com/gin-contrib/sessions](https://github.com/gin-contrib/sessions) from 1.0.2 to 1.0.3.
- [Release notes](https://github.com/gin-contrib/sessions/releases)
- [Changelog](https://github.com/gin-contrib/sessions/blob/master/.goreleaser.yaml)
- [Commits](https://github.com/gin-contrib/sessions/compare/v1.0.2...v1.0.3)

---
updated-dependencies:
- dependency-name: github.com/gin-contrib/sessions
  dependency-version: 1.0.3
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

vendor/go.mongodb.org/mongo-driver/bson/unmarshal.go

@@ -41,6 +41,9 @@ type ValueUnmarshaler interface {
 // Unmarshal parses the BSON-encoded data and stores the result in the value
 // pointed to by val. If val is nil or not a pointer, Unmarshal returns
 // InvalidUnmarshalError.
+//
+// When unmarshaling BSON, if the BSON value is null and the Go value is a
+// pointer, the pointer is set to nil without calling UnmarshalBSONValue.
 func Unmarshal(data []byte, val interface{}) error {
 	return UnmarshalWithRegistry(DefaultRegistry, data, val)
 }