Add fallback URLs for Bazel gcc toolchains (#2752)

Fixes #2747

Author: armandomontanez

MODULE.bazel

@@ -16,39 +16,54 @@ http_archive(
     build_file = "//bazel/toolchain:gcc_arm_none_eabi.BUILD",
     sha256 = "8fd8b4a0a8d44ab2e195ccfbeef42223dfb3ede29d80f14dcf2183c34b8d199a",
     strip_prefix = "arm-gnu-toolchain-13.2.Rel1-aarch64-arm-none-eabi",
-    url = "https://developer.arm.com/-/media/Files/downloads/gnu/13.2.rel1/binrel/arm-gnu-toolchain-13.2.rel1-aarch64-arm-none-eabi.tar.xz",
+    urls = [
+        "https://developer.arm.com/-/media/Files/downloads/gnu/13.2.rel1/binrel/arm-gnu-toolchain-13.2.rel1-aarch64-arm-none-eabi.tar.xz",
+        "https://armkeil.blob.core.windows.net/developer/Files/downloads/gnu/13.2.rel1/binrel/arm-gnu-toolchain-13.2.rel1-aarch64-arm-none-eabi.tar.xz",
+    ],
 )
 
 http_archive(
     name = "arm_gcc_linux-x86_64",
     build_file = "//bazel/toolchain:gcc_arm_none_eabi.BUILD",
     sha256 = "6cd1bbc1d9ae57312bcd169ae283153a9572bd6a8e4eeae2fedfbc33b115fdbb",
     strip_prefix = "arm-gnu-toolchain-13.2.Rel1-x86_64-arm-none-eabi",
-    url = "https://developer.arm.com/-/media/Files/downloads/gnu/13.2.rel1/binrel/arm-gnu-toolchain-13.2.rel1-x86_64-arm-none-eabi.tar.xz",
+    urls = [
+        "https://developer.arm.com/-/media/Files/downloads/gnu/13.2.rel1/binrel/arm-gnu-toolchain-13.2.rel1-x86_64-arm-none-eabi.tar.xz",
+        "https://armkeil.blob.core.windows.net/developer/Files/downloads/gnu/13.2.rel1/binrel/arm-gnu-toolchain-13.2.rel1-x86_64-arm-none-eabi.tar.xz",
+    ],
 )
 
 http_archive(
     name = "arm_gcc_win-x86_64",
     build_file = "//bazel/toolchain:gcc_arm_none_eabi.BUILD",
     sha256 = "51d933f00578aa28016c5e3c84f94403274ea7915539f8e56c13e2196437d18f",
     strip_prefix = "arm-gnu-toolchain-13.2.Rel1-mingw-w64-i686-arm-none-eabi",
-    url = "https://developer.arm.com/-/media/Files/downloads/gnu/13.2.rel1/binrel/arm-gnu-toolchain-13.2.rel1-mingw-w64-i686-arm-none-eabi.zip",
+    urls = [
+        "https://developer.arm.com/-/media/Files/downloads/gnu/13.2.rel1/binrel/arm-gnu-toolchain-13.2.rel1-mingw-w64-i686-arm-none-eabi.zip",
+        "https://armkeil.blob.core.windows.net/developer/Files/downloads/gnu/13.2.rel1/binrel/arm-gnu-toolchain-13.2.rel1-mingw-w64-i686-arm-none-eabi.zip",
+    ],
 )
 
 http_archive(
     name = "arm_gcc_mac-x86_64",
     build_file = "//bazel/toolchain:gcc_arm_none_eabi.BUILD",
     sha256 = "075faa4f3e8eb45e59144858202351a28706f54a6ec17eedd88c9fb9412372cc",
     strip_prefix = "arm-gnu-toolchain-13.2.Rel1-darwin-x86_64-arm-none-eabi",
-    url = "https://developer.arm.com/-/media/Files/downloads/gnu/13.2.rel1/binrel/arm-gnu-toolchain-13.2.rel1-darwin-x86_64-arm-none-eabi.tar.xz",
+    urls = [
+        "https://developer.arm.com/-/media/Files/downloads/gnu/13.2.rel1/binrel/arm-gnu-toolchain-13.2.rel1-darwin-x86_64-arm-none-eabi.tar.xz",
+        "https://armkeil.blob.core.windows.net/developer/Files/downloads/gnu/13.2.rel1/binrel/arm-gnu-toolchain-13.2.rel1-darwin-x86_64-arm-none-eabi.tar.xz",
+    ],
 )
 
 http_archive(
     name = "arm_gcc_mac-aarch64",
     build_file = "//bazel/toolchain:gcc_arm_none_eabi.BUILD",
     sha256 = "39c44f8af42695b7b871df42e346c09fee670ea8dfc11f17083e296ea2b0d279",
     strip_prefix = "arm-gnu-toolchain-13.2.Rel1-darwin-arm64-arm-none-eabi",
-    url = "https://developer.arm.com/-/media/Files/downloads/gnu/13.2.rel1/binrel/arm-gnu-toolchain-13.2.rel1-darwin-arm64-arm-none-eabi.tar.xz",
+    urls = [
+        "https://developer.arm.com/-/media/Files/downloads/gnu/13.2.rel1/binrel/arm-gnu-toolchain-13.2.rel1-darwin-arm64-arm-none-eabi.tar.xz",
+        "https://armkeil.blob.core.windows.net/developer/Files/downloads/gnu/13.2.rel1/binrel/arm-gnu-toolchain-13.2.rel1-darwin-arm64-arm-none-eabi.tar.xz",
+    ],
 )
 
 http_archive(