libs/vertexai/v3.0.3

• Fix import blocking I/O in async contexts #1267
• Bump google-cloud-storage constraint to <4.0.0 #1303
• Add transport as an alias of api_transport and fix some base_url behavior #1293

Changes since libs/vertexai/v3.0.2

chore: fix links (#1311)
release(vertexai): 3.0.3 (#1310)
chore(vertexai,genai,community): update project URLs in pyproject.toml and README.md files (#1308)
chore(genai,vertexai): nits (#1307)
fix(vertexai,community): bump google-cloud-storage constraint to <4.0.0 (#1303)
fix(vertexai): test robustness improvement (#1301)
fix: base_url behavior, and improve checks and docstrings for base_url and api_transport behavior (#1293)
fix(vertexai): resolve blocking I/O in async contexts (#1267)
chore: cleanup (#1290)