Add support for PostgreSQL procedures (CALL-based mutations) - #3124

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@v4, vale-cli/vale-action@d89dee975228ae261d22c15adcd03578634d429c. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

[vale] reported by reviewdog 🐶 [Microsoft.Passive] 'is supported' looks like passive voice. Raw Output: {"message": "[Microsoft.Passive] 'is supported' looks like passive voice.", "location": {"path": "postgraphile/website/postgraphile/procedures.md", "range": {"start": {"line": 54, "column": 11}}}, "severity": "INFO"}

[vale] reported by reviewdog 🐶 [Microsoft.Passive] 'be used' looks like passive voice. Raw Output: {"message": "[Microsoft.Passive] 'be used' looks like passive voice.", "location": {"path": "postgraphile/website/postgraphile/procedures.md", "range": {"start": {"line": 51, "column": 20}}}, "severity": "INFO"}

[vale] reported by reviewdog 🐶 [Microsoft.Semicolon] Try to simplify this sentence. Raw Output: {"message": "[Microsoft.Semicolon] Try to simplify this sentence.", "location": {"path": "postgraphile/website/postgraphile/procedures.md", "range": {"start": {"line": 46, "column": 75}}}, "severity": "INFO"}

[vale] reported by reviewdog 🐶 [Microsoft.Semicolon] Try to simplify this sentence. Raw Output: {"message": "[Microsoft.Semicolon] Try to simplify this sentence.", "location": {"path": "postgraphile/website/postgraphile/procedures.md", "range": {"start": {"line": 26, "column": 71}}}, "severity": "INFO"}

[vale] reported by reviewdog 🐶 [Microsoft.Passive] 'be exposed' looks like passive voice. Raw Output: {"message": "[Microsoft.Passive] 'be exposed' looks like passive voice.", "location": {"path": "postgraphile/website/postgraphile/procedures.md", "range": {"start": {"line": 26, "column": 22}}}, "severity": "INFO"}

[vale] reported by reviewdog 🐶 [Microsoft.SentenceLength] Try to keep sentences short (< 30 words). Raw Output: {"message": "[Microsoft.SentenceLength] Try to keep sentences short (\u003c 30 words).", "location": {"path": "postgraphile/website/postgraphile/procedures.md", "range": {"start": {"line": 26, "column": 1}}}, "severity": "INFO"}

[vale] reported by reviewdog 🐶 [Microsoft.Passive] 'be used' looks like passive voice. Raw Output: {"message": "[Microsoft.Passive] 'be used' looks like passive voice.", "location": {"path": "postgraphile/website/postgraphile/procedures.md", "range": {"start": {"line": 9, "column": 75}}}, "severity": "INFO"}

[vale] reported by reviewdog 🐶 [Microsoft.Passive] 'be invoked' looks like passive voice. Raw Output: {"message": "[Microsoft.Passive] 'be invoked' looks like passive voice.", "location": {"path": "postgraphile/website/postgraphile/procedures.md", "range": {"start": {"line": 9, "column": 28}}}, "severity": "INFO"}