Updating mbed-os to mbed-os-6.2.1

mbedmain · mbedmain · commit b748a1736999 · 2020-08-19T16:16:40.000+01:00
diff --git a/getting-started/mbed-os.lib b/getting-started/mbed-os.lib
@@ -1 +1 @@
-https://github.com/ARMmbed/mbed-os/#a2ada74770f043aff3e61e29d164a8e78274fcd4
+https://github.com/ARMmbed/mbed-os/#890f0562dc2efb7cf76a5f010b535c2b94bce849

Original file line number	Diff line number	Diff line change
`@@ -1 +1 @@`
`1`		`-https://github.com/ARMmbed/mbed-os/#a2ada74770f043aff3e61e29d164a8e78274fcd4`
	`1`	`+https://github.com/ARMmbed/mbed-os/#890f0562dc2efb7cf76a5f010b535c2b94bce849`