Update dependency @pulumi/pulumi to v3.261.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
@pulumi/pulumi (source)	3.260.0 → 3.261.0

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Release Notes

pulumi/pulumi (@​pulumi/pulumi)

v3.261.0

Compare Source

3.261.0 (2026-09-02)

Features

• [engine] Support state migration callbacks on resource registrations #​24328
• [cli/env] Add pulumi env setup {aws,azure,gcp} to configure cloud OIDC trust and create the ESC environments that use it #​23911

Bug Fixes

• [engine] Report a clear error instead of panicking when the stack's state contains a custom resource with no ID #​24438
• [cli] Show the agent account's claim URL instead of an inaccessible View Live link when running on ephemeral agent credentials #​24476
• [pcl] Fix a crash when binding a schema property with an integer constant value #​24480
• [cli/policy] Avoid hanging when policy pack fails to start up #​24492
• [pkg/testing] Fix ProgramTest for providers whose Go module or NuGet package has a double-digit major version #​24499
• [sdk] Fix serialization of secret unknowns in NodeJS, Python and PCL #​24500
• [engine] Ignore internal property keys (those starting with an underscore) when generating and checking update plans #​24532

Improvements

• [sdkgen] Generate precise Python output types for discriminated unions. An array of a union was typed Sequence[Any] and a scalar union Any, while the matching getters on the generated Args classes were already typed #​24485
• [sdk/python] Resolve a union value to its member by matching the value's wire shape, so unions whose members carry no constant properties serialize and translate with the right member's property names #​24484
• [sdkgen/python] Accept a generated output type wherever the classes-and-dicts input types accept its Args class or TypedDict, so a resource's output can be passed to another resource's input without a type error #​24507
• [engine] Send previously persisted outputs to a provider's Check on update, gated by a new sends_old_outputs_to_check handshake capability #​24524
• [sdk/python] Add helper methods to transform ResourceOptions to InvokeOptions #​24533

Miscellaneous

• [java] Upgrade java to v1.36.3 #​24509
• [yaml] Upgrade yaml to v1.38.5 #​24509
• [sdk/dotnet] Upgrade dotnet to v3.113.1 #​24512

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