rebase: Bump github.com/hashicorp/vault from 1.4.2 to 1.9.9

Bumps [github.com/hashicorp/vault](https://github.com/hashicorp/vault) from 1.4.2 to 1.9.9.
- [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/v1.4.2...v1.9.9)

---
updated-dependencies:
- dependency-name: github.com/hashicorp/vault
  dependency-type: indirect
...

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

vendor/github.com/cenkalti/backoff/v3/exponential.go

@@ -103,13 +103,14 @@ func (t systemClock) Now() time.Time {
 var SystemClock = systemClock{}
 
 // Reset the interval back to the initial retry interval and restarts the timer.
+// Reset must be called before using b.
 func (b *ExponentialBackOff) Reset() {
 	b.currentInterval = b.InitialInterval
 	b.startTime = b.Clock.Now()
 }
 
 // NextBackOff calculates the next backoff interval using the formula:
-// 	Randomized interval = RetryInterval +/- (RandomizationFactor * RetryInterval)
+// 	Randomized interval = RetryInterval * (1 ± RandomizationFactor)
 func (b *ExponentialBackOff) NextBackOff() time.Duration {
 	// Make sure we have not gone over the maximum elapsed time.
 	if b.MaxElapsedTime != 0 && b.GetElapsedTime() > b.MaxElapsedTime {