Add missing 3.15 aarch64 targets (#821)

Author: zanieb

ci-targets.yaml

@@ -374,6 +374,7 @@ linux:
       - "3.12"
       - "3.13"
       - "3.14"
+      - "3.15"
     build_options:
       # TODO: Static support is current blocked by some compiler-rt linking issues
       # - debug+static
@@ -438,6 +439,7 @@ windows:
       - "3.12"
       - "3.13"
       - "3.14"
+      - "3.15"
     build_options:
       - pgo
     build_options_conditional:

cpython-unix/targets.yml

@@ -1205,6 +1205,7 @@ aarch64-unknown-linux-musl:
     - '3.12'
     - '3.13'
     - '3.14'
+    - '3.15'
   needs_toolchain: true
   docker_image_suffix: .debian9
   needs_toolchain: true