Bump @oclif/core from 2.15.0 to 3.0.1 (#786)

* Bump @oclif/core from 2.15.0 to 3.0.1

Bumps [@oclif/core](https://github.com/oclif/core) from 2.15.0 to 3.0.1.
- [Release notes](https://github.com/oclif/core/releases)
- [Changelog](https://github.com/oclif/core/blob/main/CHANGELOG.md)
- [Commits](oclif/core@2.15.0...3.0.1)

---
updated-dependencies:
- dependency-name: "@oclif/core"
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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* Add changeset for dependabot updates

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Signed-off-by: dependabot[bot] <support@github.com>
Signed-off-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
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.changeset/blue-lions-exist.md

@@ -0,0 +1,5 @@
+---
+'@sigstore/mock-server': patch
+---
+
+Bump @oclif/core from 2.15.0 to 3.0.1

.changeset/healthy-plums-behave.md

@@ -0,0 +1,5 @@
+---
+'@sigstore/cli': patch
+---
+
+Bump @oclif/core from 2.15.0 to 3.0.1

.changeset/nine-islands-crash.md

@@ -0,0 +1,5 @@
+---
+'@sigstore/conformance': patch
+---
+
+Bump @oclif/core from 2.15.0 to 3.0.1