Don't verify python3 wheels on linux-armv6.

We aren't currently building py3 wheels for this platform (and to this
point, they haven't been requested).

Change-Id: I9528fed0816ea90c802c72d0d07afa3e88a1f5a9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/3158558
Auto-Submit: Brian Ryner <bryner@google.com>
Commit-Queue: Dirk Pranke <dpranke@google.com>
Reviewed-by: Dirk Pranke <dpranke@google.com>

.vpython3

@@ -6,7 +6,6 @@ python_version: "3.8"
 verify_pep425_tag: [
     {python: "cp38", abi: "cp38", platform: "manylinux1_x86_64"},
     {python: "cp38", abi: "cp38", platform: "linux_arm64"},
-    {python: "cp38", abi: "cp38", platform: "linux_armv6l"},
 
     {python: "cp38", abi: "cp38", platform: "macosx_10_10_intel"},
     {python: "cp38", abi: "cp38", platform: "macosx_11_0_arm64"},