chore(deps): update dependency protobuf to v6

Author: renovate-bot

requirements.txt

@@ -340,18 +340,16 @@ proto-plus==1.26.1 \
     # via
     #   google-api-core
     #   google-cloud-spanner
-protobuf==5.29.3 \
-    --hash=sha256:0a18ed4a24198528f2333802eb075e59dea9d679ab7a6c5efb017a59004d849f \
-    --hash=sha256:0eb32bfa5219fc8d4111803e9a690658aa2e6366384fd0851064b963b6d1f2a7 \
-    --hash=sha256:3ea51771449e1035f26069c4c7fd51fba990d07bc55ba80701c78f886bf9c888 \
-    --hash=sha256:5da0f41edaf117bde316404bad1a486cb4ededf8e4a54891296f648e8e076620 \
-    --hash=sha256:6ce8cc3389a20693bfde6c6562e03474c40851b44975c9b2bf6df7d8c4f864da \
-    --hash=sha256:84a57163a0ccef3f96e4b6a20516cedcf5bb3a95a657131c5c3ac62200d23252 \
-    --hash=sha256:a4fa6f80816a9a0678429e84973f2f98cbc218cca434abe8db2ad0bffc98503a \
-    --hash=sha256:a8434404bbf139aa9e1300dbf989667a83d42ddda9153d8ab76e0d5dcaca484e \
-    --hash=sha256:b89c115d877892a512f79a8114564fb435943b59067615894c3b13cd3e1fa107 \
-    --hash=sha256:c027e08a08be10b67c06bf2370b99c811c466398c357e615ca88c91c07f0910f \
-    --hash=sha256:daaf63f70f25e8689c072cfad4334ca0ac1d1e05a92fc15c54eb9cf23c3efd84
+protobuf==6.30.2 \
+    --hash=sha256:0eb523c550a66a09a0c20f86dd554afbf4d32b02af34ae53d93268c1f73bc65b \
+    --hash=sha256:35c859ae076d8c56054c25b59e5e59638d86545ed6e2b6efac6be0b6ea3ba048 \
+    --hash=sha256:4f6c687ae8efae6cf6093389a596548214467778146b7245e886f35e1485315d \
+    --hash=sha256:50f32cc9fd9cb09c783ebc275611b4f19dfdfb68d1ee55d2f0c7fa040df96815 \
+    --hash=sha256:524afedc03b31b15586ca7f64d877a98b184f007180ce25183d1a5cb230ee72b \
+    --hash=sha256:7653c99774f73fe6b9301b87da52af0e69783a2e371e8b599b3e9cb4da4b12b9 \
+    --hash=sha256:acec579c39c88bd8fbbacab1b8052c793efe83a0a5bd99db4a31423a25c0a0e2 \
+    --hash=sha256:ae86b030e69a98e08c77beab574cbcb9fff6d031d57209f574a5aea1445f4b51 \
+    --hash=sha256:b12ef7df7b9329886e66404bef5e9ce6a26b54069d7f7436a0853ccdeb91c103
     # via
     #   google-api-core
     #   google-cloud-spanner