docs: add release notes for v6.0.16

Author: github-actions[bot]

release_notes/v6.0.16.md

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+## [6.0.16](https://github.com/NHSDigital/eps-common-workflows/compare/v6.0.15...v6.0.16) (2026-04-23)
+
+
+### Upgrade
+
+* [dependabot] - bump actions/cache from 5.0.4 to 5.0.5 (#148) ([ee5ddc5](https://github.com/NHSDigital/eps-common-workflows/commit/ee5ddc507d2afdc0473f57e821bbbf500a38f22a))
+* [dependabot] - bump actions/create-github-app-token from 3.0.0 to 3.1.1 (#150) ([c06bf7c](https://github.com/NHSDigital/eps-common-workflows/commit/c06bf7ce7736e2f268f848de63d9988f6875b349))
+* [dependabot] - bump actions/upload-artifact from 7.0.0 to 7.0.1 (#151) ([a5f03ce](https://github.com/NHSDigital/eps-common-workflows/commit/a5f03ce08365b7cdc42729d140fe2bbe5ce8456b))
+* [dependabot] - bump NHSDigital/eps-copilot-instructions from 1.0.4 to 1.0.5 (#149) ([dcc5e61](https://github.com/NHSDigital/eps-common-workflows/commit/dcc5e6175feff9df293dcd3770f25c1213a6f8e7))