Bump lightning dep version (#1985)

dependence version bump
lightning from 12 to 15 because of the deprecation of device shots
initialization

---------

Co-authored-by: paul0403 <[email protected]>

Author: JerryChen97

.dep-versions

@@ -14,4 +14,4 @@ pennylane=0.43.0.dev30
 
 # For a custom LQ/LK version, update the package version here and at
 # 'doc/requirements.txt'
-lightning=0.43.0.dev12
+lightning=0.43.0.dev15

doc/requirements.txt

@@ -31,6 +31,6 @@ lxml_html_clean
 
 # Pre-install PL development wheels
 --extra-index-url https://test.pypi.org/simple/
-pennylane-lightning-kokkos==0.43.0.dev12
-pennylane-lightning==0.43.0.dev12
+pennylane-lightning-kokkos==0.43.0.dev15
+pennylane-lightning==0.43.0.dev15
 pennylane==0.43.0.dev30