use https to fetch submodules

Author: dotlambda

.gitmodules

@@ -1,6 +1,6 @@
 [submodule "tests/cts"]
 	path = tests/cts
-	url = git@github.com:jsonpath-standard/jsonpath-compliance-test-suite.git
+	url = https://github.com/jsonpath-standard/jsonpath-compliance-test-suite.git
 [submodule "tests/nts"]
 	path = tests/nts
-	url = git@github.com:jg-rp/jsonpath-compliance-normalized-paths.git
+	url = https://github.com/jg-rp/jsonpath-compliance-normalized-paths.git