chore(deps): update dependency proto-plus to v1.26.1 (#618)

Author: renovate-bot

requirements.txt

@@ -338,9 +338,9 @@ pip-tools==7.4.1 \
     --hash=sha256:4c690e5fbae2f21e87843e89c26191f0d9454f362d8acdbd695716493ec8b3a9 \
     --hash=sha256:864826f5073864450e24dbeeb85ce3920cdfb09848a3d69ebf537b521f14bcc9
     # via -r requirements.in
-proto-plus==1.26.0 \
-    --hash=sha256:6e93d5f5ca267b54300880fff156b6a3386b3fa3f43b1da62e680fc0c586ef22 \
-    --hash=sha256:bf2dfaa3da281fc3187d12d224c707cb57214fb2c22ba854eb0c105a3fb2d4d7
+proto-plus==1.26.1 \
+    --hash=sha256:13285478c2dcf2abb829db158e1047e2f1e8d63a077d94263c2b88b043c75a66 \
+    --hash=sha256:21a515a4c4c0088a773899e23c7bbade3d18f9c66c73edd4c7ee3816bc96a012
     # via
     #   google-api-core
     #   google-cloud-spanner