chore(deps): update dependency spdlog to v1.15.1

Author: renovate[bot]

Diff for: MODULE.bazel

@@ -37,7 +37,7 @@ bazel_dep(name = "zlib", version = "1.3.1.bcr.3")
 bazel_dep(name = "msgpack-c", version = "6.1.0")
 bazel_dep(name = "blake3", version = "1.5.4")
 bazel_dep(name = "fmt", version = "11.0.2")
-bazel_dep(name = "spdlog", version = "1.14.1")
+bazel_dep(name = "spdlog", version = "1.15.1")
 bazel_dep(name = "rules_python", version = "0.16.2")
 bazel_dep(name = "bazel_features", version = "1.24.0")
 bazel_dep(name = "rules_foreign_cc", version = "0.12.0")