rebase: bump github.com/hashicorp/vault/api from 1.1.1 to 1.2.0

Bumps [github.com/hashicorp/vault/api](https://github.com/hashicorp/vault) from 1.1.1 to 1.2.0.
- [Release notes](https://github.com/hashicorp/vault/releases)
- [Changelog](https://github.com/hashicorp/vault/blob/main/CHANGELOG.md)
- [Commits](https://github.com/hashicorp/vault/compare/v1.1.1...v1.2.0)

---
updated-dependencies:
- dependency-name: github.com/hashicorp/vault/api
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

vendor/github.com/mitchellh/copystructure/README.md

@@ -0,0 +1,21 @@
+# copystructure
+
+copystructure is a Go library for deep copying values in Go.
+
+This allows you to copy Go values that may contain reference values
+such as maps, slices, or pointers, and copy their data as well instead
+of just their references.
+
+## Installation
+
+Standard `go get`:
+
+```
+$ go get github.com/mitchellh/copystructure
+```
+
+## Usage & Example
+
+For usage and examples see the [Godoc](http://godoc.org/github.com/mitchellh/copystructure).
+
+The `Copy` function has examples associated with it there.