Bump to latest bosh code (6.4.0)

[o-orand]

Hi, Bosh cli v6.3.0 include a nice feature, it improve ouput logs to display bosh lifecycle step, like below:

Task 8299998

Task 8299998 | 20:36:48 | Preparing deployment: Preparing deployment (00:00:03)
Task 8299998 | 20:36:51 | Preparing deployment: Rendering templates (00:00:05)
Task 8299998 | 20:36:56 | Preparing package compilation: Finding packages to compile (00:00:00)
Task 8299998 | 20:36:56 | Updating instance db: db/d1777eb7-144c-4fde-8990-f0334f4acddf (0) (canary)
Task 8299998 | 20:36:57 | Updating instance web: web/1f5e07d8-941f-4db2-a220-4befbffea322 (0) (canary)
Task 8299998 | 20:36:57 | Updating instance db: db/d1777eb7-144c-4fde-8990-f0334f4acddf (0) (canary)
Task 8299998 | 20:36:57 | L executing pre-stop: db/d1777eb7-144c-4fde-8990-f0334f4acddf (0) (canary)
Task 8299998 | 20:36:57 | L executing drain: db/d1777eb7-144c-4fde-8990-f0334f4acddf (0) (canary)
Task 8299998 | 20:36:57 | Updating instance web: web/1f5e07d8-941f-4db2-a220-4befbffea322 (0) (canary)
Task 8299998 | 20:36:57 | L executing pre-stop: web/1f5e07d8-941f-4db2-a220-4befbffea322 (0) (canary)
Task 8299998 | 20:36:57 | L executing drain: web/1f5e07d8-941f-4db2-a220-4befbffea322 (0) (canary)
...

It would be great to bump bosh to latest code.

References: Extract from bosh cli release:

Improve output during instance update to show job lifecycle steps #168179623 requires director 271.1.0 or greater

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