Why not change to a cdn server?
I would also recommend a URL change for load balancing. It will probably also reduce download times.
diff --git a/PKGBUILD b/PKGBUILD
index d5ef8eb..2c47ac1 100644
--- a/PKGBUILD
+++ b/PKGBUILD
@@ -16,8 +16,8 @@ url="https://www.kernel.org/"
license=('GPL2')
makedepends=(bc docbook-xsl libelf pahole git inetutils kmod xmlto cpio perl tar xz)
options=('!strip')
-source=("https://www.kernel.org/pub/linux/kernel/v6.x/linux-${_basekernel}.tar.xz"
- "https://www.kernel.org/pub/linux/kernel/v6.x/patch-${pkgver}.xz"
+source=("https://cdn.kernel.org/pub/linux/kernel/v6.x/linux-${_basekernel}.tar.xz"
+ "https://cdn.kernel.org/pub/linux/kernel/v6.x/patch-${pkgver}.xz"
'config'
# ARCH Patches
'0101-ZEN_Add_sysctl_and_CONFIG_to_disallow_unprivileged_CLONE_NEWUSER.patch'