chore(deps): update dependency google-cloud-spanner to v3.50.0

Author: renovate-bot

requirements.txt

@@ -157,9 +157,9 @@ google-cloud-core==2.4.1 \
     --hash=sha256:9b7749272a812bde58fff28868d0c5e2f585b82f37e09a1f6ed2d4d10f134073 \
     --hash=sha256:a9e6a4422b9ac5c29f79a0ede9485473338e2ce78d91f2370c01e730eab22e61
     # via google-cloud-spanner
-google-cloud-spanner==3.49.1 \
-    --hash=sha256:261eafb63b0dd55256afcb5f7149b7527e55b5c8aca8059f77771dfe935ab03b \
-    --hash=sha256:c064d1175319f8c9b634a3888de226f4ec70493f7ec08a45321a4b17a47fc3ca
+google-cloud-spanner==3.50.0 \
+    --hash=sha256:6410e15d0f2b9229c0d23592ea98ab6b7387eff9e609b770b3ee0ecab0ce1fed \
+    --hash=sha256:d585aa9c2adca1ec494db93706ea0a51bce924a4e154800e049e5599adc9deb5
     # via -r requirements.in
 googleapis-common-protos[grpc]==1.65.0 \
     --hash=sha256:2972e6c496f435b92590fd54045060867f3fe9be2c82ab148fc8885035479a63 \