deps: bump github.com/dropbox/dropbox-sdk-go-unofficial/v6

Bumps the go-dependencies group with 1 update: [github.com/dropbox/dropbox-sdk-go-unofficial/v6](https://github.com/dropbox/dropbox-sdk-go-unofficial).


Updates `github.com/dropbox/dropbox-sdk-go-unofficial/v6` from 6.3.0 to 6.4.0
- [Release notes](https://github.com/dropbox/dropbox-sdk-go-unofficial/releases)
- [Changelog](https://github.com/dropbox/dropbox-sdk-go-unofficial/blob/master/CHANGELOG.md)
- [Commits](dropbox/dropbox-sdk-go-unofficial@v6.3.0...v6.4.0)

---
updated-dependencies:
- dependency-name: github.com/dropbox/dropbox-sdk-go-unofficial/v6
  dependency-version: 6.4.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: go-dependencies
...

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

Author: dependabot[bot]

go.mod

@@ -3,7 +3,7 @@ module github.com/dropbox/dbxcli/v3
 go 1.25.0
 
 require (
-	github.com/dropbox/dropbox-sdk-go-unofficial/v6 v6.3.0
+	github.com/dropbox/dropbox-sdk-go-unofficial/v6 v6.4.0
 	github.com/dustin/go-humanize v1.0.1
 	github.com/mitchellh/go-homedir v1.1.0
 	github.com/mitchellh/ioprogress v0.0.0-20180201004757-6a23b12fa88e

go.sum

@@ -2,8 +2,8 @@ github.com/cpuguy83/go-md2man/v2 v2.0.6 h1:XJtiaUW6dEEqVuZiMTn1ldk455QWwEIsMIJlo
 github.com/cpuguy83/go-md2man/v2 v2.0.6/go.mod h1:oOW0eioCTA6cOiMLiUPZOpcVxMig6NIQQ7OS05n1F4g=
 github.com/dlclark/regexp2 v1.11.0 h1:G/nrcoOa7ZXlpoa/91N3X7mM3r8eIlMBBJZvsz/mxKI=
 github.com/dlclark/regexp2 v1.11.0/go.mod h1:DHkYz0B9wPfa6wondMfaivmHpzrQ3v9q8cnmRbL6yW8=
-github.com/dropbox/dropbox-sdk-go-unofficial/v6 v6.3.0 h1:VhU21dV7Y76CgH2SXU5bcRJTNBS+Iw1ZhEK2MYfQ/xM=
-github.com/dropbox/dropbox-sdk-go-unofficial/v6 v6.3.0/go.mod h1:D7aEhXjUiLSj1u7Hem6WmS15Vk/0lxcsDZP/sZFeqQ4=
+github.com/dropbox/dropbox-sdk-go-unofficial/v6 v6.4.0 h1:OYMx56y2as2FIM6QuS5HGXC2AYtf5xv/2n6INaluF4Y=
+github.com/dropbox/dropbox-sdk-go-unofficial/v6 v6.4.0/go.mod h1:gDXhl0OElhzYoDsYWHr1RXjpxjGeLzEvjYzH7sZV73k=
 github.com/dustin/go-humanize v1.0.1 h1:GzkhY7T5VNhEkwH0PVJgjz+fX1rhBrR7pRT3mDkpeCY=
 github.com/dustin/go-humanize v1.0.1/go.mod h1:Mu1zIs6XwVuF/gI1OepvI0qD18qycQx+mFykh5fBlto=
 github.com/inconshreveable/mousetrap v1.1.0 h1:wN+x4NVGpMsO7ErUn/mUI3vEoE6Jt13X2s0bqwp9tc8=