build: bump Cabal pin to aa57a49 (musl T14304 $ORIGIN rpath fix)

aa57a49 is 8b8433b plus a Link.hs fix to always include the artifact own dir
($ORIGIN / @loader_path) in emitted rpaths, so a same-dir sibling (Backpack
signature impl libHSp next to libHSindef) is found by musl loader. Fixes
backpack/cabal/T14304 on Alpine; no-op on glibc.

Author: angerman

cabal.project.stage0

@@ -12,8 +12,13 @@ source-repository-package
   --      ("ld: cannot find -lHSbytestring-...-ghc9.8.4", incl. glibc deb11/Mac).
   --      8b8433b carries that fix — it is the pin stable-haskell/ghc #181 uses
   --      and builds green on all platforms with DYNAMIC=1.
+  --   3. aa57a49 adds, on top of 8b8433b, a fix to always include the
+  --      artifact's own dir ($ORIGIN/@loader_path) in emitted rpaths, so a
+  --      same-dir sibling (e.g. a Backpack signature impl) is found by musl's
+  --      loader (GHC testsuite T14304 on Alpine; glibc masked it via runtime
+  --      LD_LIBRARY_PATH, which musl ignores).
   -- Revisit (move back to master) once the host-only handling lands there.
-  tag: 8b8433b736d45ec53a103baf4e4aabb8010ca2ed
+  tag: aa57a49b187b067f060eb9f87499edefe5d05120
   subdir: Cabal
           Cabal-syntax
           cabal-install

cabal.project.stage1

@@ -46,7 +46,7 @@ source-repository-package
   type: git
   location: https://github.com/stable-haskell/Cabal.git
   -- Pinned to 8b8433b (feature/wasm-cross-ghcup-stack); see cabal.project.stage0.
-  tag: 8b8433b736d45ec53a103baf4e4aabb8010ca2ed
+  tag: aa57a49b187b067f060eb9f87499edefe5d05120
   subdir: Cabal
           Cabal-syntax
 

cabal.project.stage2.common

@@ -85,7 +85,7 @@ source-repository-package
   type: git
   location: https://github.com/stable-haskell/Cabal.git
   -- Pinned to 8b8433b (feature/wasm-cross-ghcup-stack); see cabal.project.stage0.
-  tag: 8b8433b736d45ec53a103baf4e4aabb8010ca2ed
+  tag: aa57a49b187b067f060eb9f87499edefe5d05120
   subdir: Cabal
           Cabal-syntax
 

cabal.project.stage3

@@ -68,7 +68,7 @@ source-repository-package
   type: git
   location: https://github.com/stable-haskell/Cabal.git
   -- Pinned to 8b8433b (feature/wasm-cross-ghcup-stack); see cabal.project.stage0.
-  tag: 8b8433b736d45ec53a103baf4e4aabb8010ca2ed
+  tag: aa57a49b187b067f060eb9f87499edefe5d05120
   subdir: Cabal
           Cabal-syntax