add Pkg 1.11 news to HISTORY.md (JuliaLang#56277)

Backport already on JuliaLang#56228

HISTORY.md

@@ -136,6 +136,14 @@ Standard library changes
   `AnnotatedString` with various faces or other attributes applied ([#49586]).
 
 #### Package Manager
+* It is now possible to specify "sources" for packages in a `[sources]` section in Project.toml.
+  This can be used to add non-registered normal or test dependencies.
+* Pkg now obeys `[compat]` bounds for `julia` and raises an error if the version of the running Julia binary is incompatible with the bounds in `Project.toml`.
+  Pkg has always obeyed this compat when working with Registry packages. This change affects mostly local packages
+* `pkg> add` and `Pkg.add` will now add compat entries for new direct dependencies if the active environment is a
+  package (has a `name` and `uuid` entry).
+* Dependencies can now be directly added as weak deps or extras via the `pkg> add --weak/extra Foo` or
+  `Pkg.add("Foo", target=:weakdeps/:extras)` forms.
 
 #### LinearAlgebra
 * `cbrt(::AbstractMatrix{<:Real})` is now defined and returns real-valued matrix cube roots of real-valued matrices ([#50661]).