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==5.29.4 \
-    --hash=sha256:13eb236f8eb9ec34e63fc8b1d6efd2777d062fa6aaa68268fb67cf77f6839ad7 \
-    --hash=sha256:1832f0515b62d12d8e6ffc078d7e9eb06969aa6dc13c13e1036e39d73bebc2de \
-    --hash=sha256:307ecba1d852ec237e9ba668e087326a67564ef83e45a0189a772ede9e854dd0 \
-    --hash=sha256:3fde11b505e1597f71b875ef2fc52062b6a9740e5f7c8997ce878b6009145862 \
-    --hash=sha256:476cb7b14914c780605a8cf62e38c2a85f8caff2e28a6a0bad827ec7d6c85d68 \
-    --hash=sha256:4f1dfcd7997b31ef8f53ec82781ff434a28bf71d9102ddde14d076adcfc78c99 \
-    --hash=sha256:678974e1e3a9b975b8bc2447fca458db5f93a2fb6b0c8db46b6675b5b5346812 \
-    --hash=sha256:aec4962f9ea93c431d5714ed1be1c93f13e1a8618e70035ba2b0564d9e633f2e \
-    --hash=sha256:bcefcdf3976233f8a502d265eb65ea740c989bacc6c30a58290ed0e519eb4b8d \
-    --hash=sha256:d7d3f7d1d5a66ed4942d4fefb12ac4b14a29028b209d4bfb25c68ae172059922 \
-    --hash=sha256:fd32223020cb25a2cc100366f1dedc904e2d71d9322403224cdde5fdced0dabe
+protobuf==6.31.1 \
+    --hash=sha256:0414e3aa5a5f3ff423828e1e6a6e907d6c65c1d5b7e6e975793d5590bdeecc16 \
+    --hash=sha256:426f59d2964864a1a366254fa703b8632dcec0790d8862d30034d8245e1cd447 \
+    --hash=sha256:4ee898bf66f7a8b0bd21bce523814e6fbd8c6add948045ce958b73af7e8878c6 \
+    --hash=sha256:6f1227473dc43d44ed644425268eb7c2e488ae245d51c6866d19fe158e207402 \
+    --hash=sha256:720a6c7e6b77288b85063569baae8536671b39f15cc22037ec7045658d80489e \
+    --hash=sha256:7fa17d5a29c2e04b7d90e5e32388b8bfd0e7107cd8e616feef7ed3fa6bdab5c9 \
+    --hash=sha256:8764cf4587791e7564051b35524b72844f845ad0bb011704c3736cce762d8fe9 \
+    --hash=sha256:a40fc12b84c154884d7d4c4ebd675d5b3b5283e155f324049ae396b95ddebc39 \
+    --hash=sha256:d8cac4c982f0b957a4dc73a80e2ea24fab08e679c0de9deb835f4a12d69aca9a
     # via
     #   google-api-core
     #   google-cloud-spanner