Update GCC version for aarch64-musl (#218)

The underlying bug referenced in
#67 (comment)
is now fixed

Author: jackkleeman

.github/workflows/Build.yml

@@ -96,7 +96,7 @@ jobs:
       TARGET_MATRIX: |
         - IMAGE_TAG: aarch64-musl
           TARGET: aarch64-unknown-linux-musl
-          RUST_MUSL_MAKE_CONFIG: config.mak.aarch64
+          RUST_MUSL_MAKE_CONFIG: config.mak
           TOOLCHAIN: stable
         - IMAGE_TAG: arm-musleabi
           TARGET: arm-unknown-linux-musleabi