Tarballs: Rename armv7a-linux -> arm-linux.

Author: alexrp

.github/workflows/build-commit.zig

@@ -86,7 +86,7 @@ const targets = [_]Target{
     .{
         .triple = "arm-linux-musleabi",
         .cpu = "baseline",
-        .key = "armv7a-linux",
+        .key = "arm-linux",
     },
     .{
         .triple = "loongarch64-linux-musl",

.github/workflows/index.json

@@ -34,10 +34,10 @@
       "shasum": "{{aarch64-linux-shasum}}",
       "size": "{{aarch64-linux-bytesize}}"
     },
-    "armv7a-linux": {
-      "tarball": "https://ziglang.org/builds/{{armv7a-linux-tarball}}",
-      "shasum": "{{armv7a-linux-shasum}}",
-      "size": "{{armv7a-linux-bytesize}}"
+    "arm-linux": {
+      "tarball": "https://ziglang.org/builds/{{arm-linux-tarball}}",
+      "shasum": "{{arm-linux-shasum}}",
+      "size": "{{arm-linux-bytesize}}"
     },
     "riscv64-linux": {
       "tarball": "https://ziglang.org/builds/{{riscv64-linux-tarball}}",