downgrade go-ldap client to v3.4.4 due to race conditions in tests

[raymonstah]

Follow up to #22185, which introduced the cap/ldap library, and bumped the go-ldap library version to v3.4.5. Unfortunately, this caused some test failures due to race conditions.

This PR downgrades go-ldap to v3.4.4 to avoid the race conditions.

Example of data race:

WARNING: DATA RACE
Read at 0x00c00d6a6480 by goroutine 108756:
  github.com/go-ldap/ldap/v3.(*Conn).Close()
      /home/runner/go/pkg/mod/github.com/go-ldap/ldap/[email protected]/conn.go:291 +0x1bd
  github.com/go-ldap/ldap/v3.(*Conn).reader.func1()
      /home/runner/go/pkg/mod/github.com/go-ldap/ldap/[email protected]/conn.go:582 +0x104
  runtime.deferreturn()
      /home/runner/actions-runner/_work/_tool/go/1.21.1/x64/src/runtime/panic.go:477 +0x30
  github.com/go-ldap/ldap/v3.(*Conn).Start.func1()
      /home/runner/go/pkg/mod/github.com/go-ldap/ldap/[email protected]/conn.go:267 +0x33

Previous write at 0x00c00d6a6480 by goroutine 83821:
  sync/atomic.StoreInt64()
      /home/runner/actions-runner/_work/_tool/go/1.21.1/x64/src/runtime/race_amd64.s:237 +0xb
  sync/atomic.StoreInt64()
      <autogenerated>:1 +0x15
  github.com/hashicorp/cap/ldap.(*Client).Authenticate()
      /home/runner/go/pkg/mod/github.com/hashicorp/cap/[email protected]/client.go:228 +0x204

[github-actions]

CI Results:
All Go tests succeeded! ✅

[austingebauer]

Thanks!

[github-actions]

Build Results:
All builds succeeded! ✅

[raymonstah]

There's a fix in go-ldap/ldap#465.
Will wait for a v3.4.6 release before introducing back into Vault

[cpuschma]

One of the maintainers of go-ldap here. Sorry for the race condition and thank you for the PR @raymonstah. Version v3.4.6 has been released.