fix: correct 'occured' typos to 'occurred'

[thecaptain789]

Fixed spelling of 'occurred' (double r) in error messages and comments across 4 files:

• internal/lang/funcs/crypto.go
• internal/stacks/stackruntime/internal/stackeval/applying.go
• internal/states/state.go
• internal/states/statefile/version4.go

This is a simple documentation/string fix with no functional changes.

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[github-actions]

Changelog Warning

Currently this PR would target a v1.15 release. Please add a changelog entry for in the .changes/v1.15 folder, or discuss which release you'd like to target with your reviewer. If you believe this change does not need a changelog entry, please add the 'no-changelog-needed' label.

[crw]

Thanks for this submission! To avoid merge conflicts, we usually only make these types of typo changes when we are making more substantive edits to the surrounding file. Thank you for alerting us to these mistakes, and the next time these files are being worked on we shall endeavor to correct the misspellings.