deps: Bump `com_github_bufbuild_buf` -> 1.26.1 (#29210)

Fix #28947

Signed-off-by: Ryan Northey <ryan@synca.io>

Mirrored from https://github.com/envoyproxy/envoy @ df749bcd8b39bb615c88045e07326fed1378d916

bazel/repository_locations.bzl

@@ -131,11 +131,11 @@ REPOSITORY_LOCATIONS_SPEC = dict(
         project_name = "buf",
         project_desc = "A new way of working with Protocol Buffers.",  # Used for breaking change detection in API protobufs
         project_url = "https://buf.build",
-        version = "1.25.0",
-        sha256 = "1531e8fa3c02bd397781602cd603a977ed6256cf502f6f78d6ba0058b78c38ac",
+        version = "1.26.1",
+        sha256 = "7286b1c6c84392f327991fd4c7b2e7f1bcff141cd1249e797a93d094c2f662ba",
         strip_prefix = "buf",
         urls = ["https://github.com/bufbuild/buf/releases/download/v{version}/buf-Linux-x86_64.tar.gz"],
-        release_date = "2023-07-18",
+        release_date = "2023-08-09",
         use_category = ["api"],
         license = "Apache-2.0",
         license_url = "https://github.com/bufbuild/buf/blob/v{version}/LICENSE",