Bump io.github.frankois944.spmForKmp from 1.1.0 to 1.2.1

Bumps io.github.frankois944.spmForKmp from 1.1.0 to 1.2.1.

---
updated-dependencies:
- dependency-name: io.github.frankois944.spmForKmp
  dependency-version: 1.2.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

gradle/libs.versions.toml

@@ -18,7 +18,7 @@ coil3 = "3.3.0"
 okio = "3.16.4"
 credentials = "1.5.0"
 sketch = "4.3.1"
-spm = "1.1.0"
+spm = "1.2.1"
 [plugins]
 kotlin-multiplatform = { id = "org.jetbrains.kotlin.multiplatform", version.ref = "kotlin" }
 dokka = { id = "org.jetbrains.dokka", version.ref = "dokka" }