go.mod: bump github.com/cloudflare/circl (#16264)

See https://github.com/cloudflare/circl/security/advisories/GHSA-2x5j-vhc8-9cwm

This dependency is used in our release builder indirectly via
https://github.com/ProtonMail/go-crypto/blob/3b22d8539b95b3b7e76a911053023e6ef9ef51d6/go.mod#L6
We should not be affected, since this is used indirectly for pgp
signatures on our .deb releases, where we use only trusted inputs.

Updates #cleanup

Signed-off-by: Andrew Lytvynov <awly@tailscale.com>

go.sum

@@ -226,8 +226,8 @@ github.com/circonus-labs/circonusllhist v0.1.3/go.mod h1:kMXHVDlOchFAehlya5ePtbp
 github.com/ckaznocha/intrange v0.1.0 h1:ZiGBhvrdsKpoEfzh9CjBfDSZof6QB0ORY5tXasUtiew=
 github.com/ckaznocha/intrange v0.1.0/go.mod h1:Vwa9Ekex2BrEQMg6zlrWwbs/FtYw7eS5838Q7UjK7TQ=
 github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
-github.com/cloudflare/circl v1.3.7 h1:qlCDlTPz2n9fu58M0Nh1J/JzcFpfgkFHHX3O35r5vcU=
-github.com/cloudflare/circl v1.3.7/go.mod h1:sRTcRWXGLrKw6yIGJ+l7amYJFfAXbZG0kBSc8r4zxgA=
+github.com/cloudflare/circl v1.6.1 h1:zqIqSPIndyBh1bjLVVDHMPpVKqp8Su/V+6MeDzzQBQ0=
+github.com/cloudflare/circl v1.6.1/go.mod h1:uddAzsPgqdMAYatqJ0lsjX1oECcQLIlRpzZh3pJrofs=
 github.com/cncf/udpa/go v0.0.0-20191209042840-269d4d468f6f/go.mod h1:M8M6+tZqaGXZJjfX53e64911xZQV5JYwmTeXPW+k8Sc=
 github.com/coder/websocket v1.8.12 h1:5bUXkEPPIbewrnkU8LTCLVaxi4N4J8ahufH2vlo4NAo=
 github.com/coder/websocket v1.8.12/go.mod h1:LNVeNrXQZfe5qhS9ALED3uA+l5pPqvwXg3CKoDBB2gs=