Bump semver and @dataform/core

Bumps [semver](https://github.com/npm/node-semver) to 7.5.3 and updates ancestor dependency [@dataform/core](https://github.com/dataform-co/dataform). These dependencies need to be updated together.


Updates `semver` from 5.7.1 to 7.5.3
- [Release notes](https://github.com/npm/node-semver/releases)
- [Changelog](https://github.com/npm/node-semver/blob/main/CHANGELOG.md)
- [Commits](npm/node-semver@v5.7.1...v7.5.3)

Updates `@dataform/core` from 1.4.5 to 2.6.0
- [Release notes](https://github.com/dataform-co/dataform/releases)
- [Commits](dataform-co/dataform@1.4.5...2.6.0)

---
updated-dependencies:
- dependency-name: semver
  dependency-type: indirect
- dependency-name: "@dataform/core"
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

package.json

@@ -1,6 +1,6 @@
 {
     "name": "dataform-stripe",
     "dependencies": {
-        "@dataform/core": "1.4.5"
+        "@dataform/core": "2.6.0"
     }
 }