chore: ⬆️ Update ggml-org/llama.cpp to 6050b467c07a95c7b87debd4ddac2f8ba8d9b807 (#12908)

* ⬆️ Update ggml-org/llama.cpp

Signed-off-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

* fix(llama-cpp): retry transient source fetches

GitHub TLS handshake failures stop CUDA builds before checkout.
Retry the shared source fetch three times with 3s and 6s delays.
Keep checkout blocked when all attempts fail.

Assisted-by: nib:gpt-6.1-sol
Signed-off-by: Ettore Di Giacinto <mudler@localai.io>

---------

Signed-off-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
Signed-off-by: Ettore Di Giacinto <mudler@localai.io>
Co-authored-by: mudler <2420543+mudler@users.noreply.github.com>
Co-authored-by: Ettore Di Giacinto <mudler@localai.io>

backend/cpp/llama-cpp/Makefile

@@ -1,5 +1,5 @@
 
-LLAMA_VERSION?=78a8ae14be559b45f5f13ddee82c188b683d5d8d
+LLAMA_VERSION?=6050b467c07a95c7b87debd4ddac2f8ba8d9b807
 LLAMA_REPO?=https://github.com/ggerganov/llama.cpp
 
 CMAKE_ARGS?=
@@ -169,7 +169,19 @@ llama.cpp:
 	cd llama.cpp && \
 	git init && \
 	git remote add origin $(LLAMA_REPO)  && \
-	git fetch --all --tags && \
+	( \
+		attempt=1; \
+		until git fetch --all --tags; do \
+			if [ "$$attempt" -ge 3 ]; then \
+				echo "git fetch failed after $$attempt attempts" >&2; \
+				exit 1; \
+			fi; \
+			delay=$$((attempt * 3)); \
+			echo "git fetch attempt $$attempt failed; retrying in $${delay}s" >&2; \
+			sleep "$$delay" || exit 1; \
+			attempt=$$((attempt + 1)); \
+		done \
+	) && \
 	git checkout -b build $(LLAMA_VERSION) && \
 	git submodule update --init --recursive --depth 1 --single-branch