Fix bazel link

http://www.frc971.org/ is a 301 now to the https variant.  curl won't
follow the 301 by default.  We can just point at the new location.

Change-Id: I25546589549185a346f93e2a5e618c378a63bfec
diff --git a/tools/bazel b/tools/bazel
index d9b6c86..4589ca1 100755
--- a/tools/bazel
+++ b/tools/bazel
@@ -41,7 +41,7 @@
 fi
 
 readonly INSTALLER_NAME="bazel_${VERSION}.xz"
-readonly DOWNLOAD_URL="http://www.frc971.org/Build-Dependencies/${INSTALLER_NAME}"
+readonly DOWNLOAD_URL="https://www.frc971.org/Build-Dependencies/${INSTALLER_NAME}"
 
 if [[ ! -d "${VERSION_DIR}" ]]; then
   echo "Downloading Bazel version ${VERSION} from ${DOWNLOAD_URL}..." >&2