Update git submodules

* Update docs/submodules/music.git from branch 'elalto'
  to da5ad5ecc57dd98654c96eb30965e09bbd22dc48
  - El Alto Release Notes
    
    Change-Id: I6703f52383d9901cb1e08b5ce92fb6e66b454cfa
    Issue-ID: MUSIC-496
    Signed-off-by: Tschaen, Brendan <ctschaen@att.com>
    
  - Jackson Faster-xml vulnerability.
    
    CVE-2019-14439 Information Disclosure Vulnerability
    
    FasterXML Jackson-databind is prone to an information-disclosure
    vulnerability that occurs due to a polymorphic typing issue.
    Specifically, this issue occurs when an externally exposed JSON endpoint
    has default typing enabled and has logback jar in the classpath.
    
    An attacker can exploit this issue to obtain sensitive information that
    may aid in further attacks.
    
    Issue-ID: MUSIC-504
    Signed-off-by: Thomas Nelson (arthurdent3) <nelson24@att.com>
    Signed-off-by: Thomas Nelson (arthurdent3) <nelson24@att.com>
    Change-Id: I2c31986ff2d792d482f84406e96c47dbf652f32f
    
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