workspace: bump bazel to 7.2.1

Change-Id: I6cde34a1f35f77a7688089de24f7963100ede058
Reviewed-on: https://review.monogon.dev/c/monogon/+/3216
Tested-by: Jenkins CI
Reviewed-by: Lorenz Brun <lorenz@monogon.tech>
diff --git a/third_party/nix/env.nix b/third_party/nix/env.nix
index b329f7c..43232f3 100644
--- a/third_party/nix/env.nix
+++ b/third_party/nix/env.nix
@@ -40,8 +40,8 @@
     (stdenv.mkDerivation {
       name = "bazel";
       src = builtins.fetchurl {
-        url = "https://github.com/bazelbuild/bazel/releases/download/7.0.0/bazel-7.0.0-linux-x86_64";
-        sha256 = "0vnlpfwq1nnigscybwc7cxd9n14zrcsk7jzrrc66wwzr882zf94b";
+        url = "https://github.com/bazelbuild/bazel/releases/download/7.2.1/bazel-7.2.1-linux-x86_64";
+        sha256 = "0xbqyq5lhpjmaqrz223qvalwpp9g0xkjsqnpwpxm11xqnknd3k40";
       };
       unpackPhase = ''
         true