chore(deps): update dependency proto-plus to v1.26.0 (#592)

Author: renovate-bot

.kokoro/requirements.txt

@@ -477,9 +477,9 @@ platformdirs==4.3.6 \
     --hash=sha256:357fb2acbc885b0419afd3ce3ed34564c13c9b95c89360cd9563f73aa5e2b907 \
     --hash=sha256:73e575e1408ab8103900836b97580d5307456908a03e92031bab39e4554cc3fb
     # via virtualenv
-proto-plus==1.25.0 \
-    --hash=sha256:c91fc4a65074ade8e458e95ef8bac34d4008daa7cce4a12d6707066fca648961 \
-    --hash=sha256:fbb17f57f7bd05a68b7707e745e26528b0b3c34e378db91eef93912c54982d91
+proto-plus==1.26.0 \
+    --hash=sha256:6e93d5f5ca267b54300880fff156b6a3386b3fa3f43b1da62e680fc0c586ef22 \
+    --hash=sha256:bf2dfaa3da281fc3187d12d224c707cb57214fb2c22ba854eb0c105a3fb2d4d7
     # via
     #   -r requirements.in
     #   google-api-core

requirements.txt

@@ -338,9 +338,9 @@ pip-tools==7.4.1 \
     --hash=sha256:4c690e5fbae2f21e87843e89c26191f0d9454f362d8acdbd695716493ec8b3a9 \
     --hash=sha256:864826f5073864450e24dbeeb85ce3920cdfb09848a3d69ebf537b521f14bcc9
     # via -r requirements.in
-proto-plus==1.25.0 \
-    --hash=sha256:c91fc4a65074ade8e458e95ef8bac34d4008daa7cce4a12d6707066fca648961 \
-    --hash=sha256:fbb17f57f7bd05a68b7707e745e26528b0b3c34e378db91eef93912c54982d91
+proto-plus==1.26.0 \
+    --hash=sha256:6e93d5f5ca267b54300880fff156b6a3386b3fa3f43b1da62e680fc0c586ef22 \
+    --hash=sha256:bf2dfaa3da281fc3187d12d224c707cb57214fb2c22ba854eb0c105a3fb2d4d7
     # via
     #   google-api-core
     #   google-cloud-spanner