Fix Licensee not finding Coil's Licence url (#774)

It seems that there's a typo on the key for the licence url, according to to what gradle-maven-publish-plugin[1] expects.

This typo then causes Licensee[2] to not find Coil's Licence URL, returning null, blocking us from adding it to the allowlist.

[1]: https://github.com/vanniktech/gradle-maven-publish-plugin/blob/fc8c5c2982d319c7debf3bc88ac2e1a6e64fcbad/src/main/kotlin/com/vanniktech/maven/publish/MavenPublishBaseExtension.kt#L183
[2]: https://github.com/cashapp/licensee

gradle.properties

@@ -27,7 +27,7 @@ POM_SCM_CONNECTION=scm:git:git://github.com/coil-kt/coil.git
 POM_SCM_DEV_CONNECTION=scm:git:ssh://git@github.com/coil-kt/coil.git
 
 POM_LICENCE_NAME=The Apache License, Version 2.0
-POM_LICENSE_URL=https://www.apache.org/licenses/LICENSE-2.0.txt
+POM_LICENCE_URL=https://www.apache.org/licenses/LICENSE-2.0.txt
 POM_LICENCE_DIST=repo
 
 POM_DEVELOPER_ID=coil-kt