VAULT-24619: bump go version to 1.22.2 for 1.16.x

[ccapurso]

This PR also upgrades layeh.com/radius as there were tests failing with the following panics:

panic: runtime error: slice bounds out of range [:16] with capacity 4 [recovered]
	panic: runtime error: slice bounds out of range [:16] with capacity 4

goroutine 63 [running]:
testing.tRunner.func1.2({0x2cf0880, 0xc0009fe000})
	/opt/hostedtoolcache/go/1.22.2/x64/src/testing/testing.go:1631 +0x24a
testing.tRunner.func1()
	/opt/hostedtoolcache/go/1.22.2/x64/src/testing/testing.go:1634 +0x377
panic({0x2cf0880?, 0xc0009fe000?})
	/opt/hostedtoolcache/go/1.22.2/x64/src/runtime/panic.go:770 +0x132
layeh.com/radius.NewUserPassword({0x2f0ee0f, 0x4, 0x4}, {0xc001754ee0, 0xa, 0x10}, {0xc001512349, 0x10, 0x10})
	/home/runner/go/pkg/mod/layeh.com/radius@v0.0.0-20190322222518-890bc1058917/attribute.go:207 +0x525
layeh.com/radius/rfc2865.UserPassword_SetString(0xc001512340, {0x2f0ee0f?, 0x1?})

This issue was fixed about 7 months ago in layeh/radius@6c2c615. Unfortunately, the library does not tag its releases. Hopefully it is safe to move to latest but I'm interested if anyone with more context on the dependency has any issue with moving that far ahead.

[github-actions]

CI Results:
All Go tests succeeded! ✅

[github-actions]

Build Results:
All builds succeeded! ✅