Update WfContext::cancelled to take &self instead of &mut self · temporalio/sdk-core@abc8a46

The following actions uses node12 which is deprecated and will be forced to run on node16: actions/checkout@v2, actions-rs/toolchain@v1, actions-rs/cargo@v1. For more info: https://github.blog/changelog/2023-06-13-github-actions-all-actions-will-run-on-node16-instead-of-node12-by-default/

Run actions-rs/cargo@v1: tests/integ_tests/workflow_tests/cancel_external.rs#L28

variable does not need to be mutable

Run actions-rs/cargo@v1: tests/integ_tests/workflow_tests/cancel_wf.rs#L7

variable does not need to be mutable

Run actions-rs/cargo@v1: tests/integ_tests/workflow_tests/child_workflows.rs#L67

variable does not need to be mutable

Run actions-rs/cargo@v1: tests/integ_tests/workflow_tests/child_workflows.rs#L92

variable does not need to be mutable

Run actions-rs/cargo@v1: tests/integ_tests/workflow_tests/child_workflows.rs#L138

variable does not need to be mutable

`temporal-sdk-core` (test "integ_tests") generated 5 warnings (run `cargo fix --test "integ_tests"` to apply 5 suggestions)

Run actions-rs/cargo@v1: tests/integ_tests/workflow_tests/cancel_external.rs#L28

variable does not need to be mutable

Run actions-rs/cargo@v1: tests/integ_tests/workflow_tests/cancel_wf.rs#L7

variable does not need to be mutable

Run actions-rs/cargo@v1: tests/integ_tests/workflow_tests/child_workflows.rs#L67

variable does not need to be mutable

Run actions-rs/cargo@v1: tests/integ_tests/workflow_tests/child_workflows.rs#L92

variable does not need to be mutable

The `set-output` command is deprecated and will be disabled soon. Please upgrade to using Environment Files. For more information see: https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/

The `set-output` command is deprecated and will be disabled soon. Please upgrade to using Environment Files. For more information see: https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/

The `set-output` command is deprecated and will be disabled soon. Please upgrade to using Environment Files. For more information see: https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/

The `set-output` command is deprecated and will be disabled soon. Please upgrade to using Environment Files. For more information see: https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/

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