add NEWS entry

Author: dkarrasch

NEWS.md

@@ -98,6 +98,9 @@ Standard library changes
 * The shape of an `UpperHessenberg` matrix is preserved under certain arithmetic operations, e.g. when multiplying or dividing by an `UpperTriangular` matrix. ([#40039])
 * `cis(A)` now supports matrix arguments ([#40194]).
 * `dot` now supports `UniformScaling` with `AbstractMatrix` ([#40250]).
+* `qr[!]` and `lu[!]` now support `Symbol` values as their optional `pivot` argument:
+  defaults are `qr(A, :none)` (vs. `qr(A, :colnorm)` for pivoting) and `lu(A, :rowmax)`
+  (vs. `lu(A, :none)` without pivoting); the former `Val{true/false}`-based calls are deprecated. ([#40623])
 
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