Update sbt to 1.7.0 in main

http4s-steward[bot] · http4s-steward[bot] · commit 04244efc1d80 · 2022-07-10T20:36:55.000Z
diff --git a/project/build.properties b/project/build.properties
@@ -1 +1 @@
-sbt.version=1.6.2
+sbt.version=1.7.0
