chore(deps): update dependency protobuf to v6

Author: renovate-bot

requirements.txt

@@ -396,18 +396,16 @@ proto-plus==1.26.1 \
     # via
     #   google-api-core
     #   google-cloud-spanner
-protobuf==5.29.5 \
-    --hash=sha256:3f1c6468a2cfd102ff4703976138844f78ebd1fb45f49011afc5139e9e283079 \
-    --hash=sha256:3f76e3a3675b4a4d867b52e4a5f5b78a2ef9565549d4037e06cf7b0942b1d3fc \
-    --hash=sha256:470f3af547ef17847a28e1f47200a1cbf0ba3ff57b7de50d22776607cd2ea353 \
-    --hash=sha256:63848923da3325e1bf7e9003d680ce6e14b07e55d0473253a690c3a8b8fd6e61 \
-    --hash=sha256:6cf42630262c59b2d8de33954443d94b746c952b01434fc58a417fdbd2e84bd5 \
-    --hash=sha256:6f642dc9a61782fa72b90878af134c5afe1917c89a568cd3476d758d3c3a0736 \
-    --hash=sha256:7318608d56b6402d2ea7704ff1e1e4597bee46d760e7e4dd42a3d45e24b87f2e \
-    --hash=sha256:bc1463bafd4b0929216c35f437a8e28731a2b7fe3d98bb77a600efced5a15c84 \
-    --hash=sha256:e38c5add5a311f2a6eb0340716ef9b039c1dfa428b28f25a7838ac329204a671 \
-    --hash=sha256:ef91363ad4faba7b25d844ef1ada59ff1604184c0bcd8b39b8a6bef15e1af238 \
-    --hash=sha256:fa18533a299d7ab6c55a238bf8629311439995f2e7eca5caaff08663606e9015
+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