Bump php81_bc/strftime from 0.7.4 to 0.7.6 (#868)

Bumps [php81_bc/strftime](https://github.com/alphp/strftime) from 0.7.4 to 0.7.6.
- [Release notes](https://github.com/alphp/strftime/releases)
- [Commits](alphp/strftime@0.7.4...0.7.6)

---
updated-dependencies:
- dependency-name: php81_bc/strftime
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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