Codeql is giving warning: Invalid Go toolchain version

[friedrichg]

Describe the bug
CodeQl is refusing to analyse the cortex code

To Reproduce
Steps to reproduce the behavior:
https://github.com/cortexproject/cortex/security/code-scanning/tools/CodeQL/status/configurations/actions-FZTWS5DIOVRC653POJVWM3DPO5ZS65DFON2C2YTVNFWGILLEMVYGY33ZFZ4W23A/42065a090d6e5bc992b82fafa11d0bd003344f9e8baec9c2f02bffa068a55410

As of Go 1.21, toolchain versions [must use the 1.N.P syntax](https://go.dev/doc/toolchain#version).

1.21 in go.mod does not match this syntax and there is no additional toolchain directive, which may cause some go commands to fail.

Expected behavior
it should not fail or give warnings

[stale]

This issue has been automatically marked as stale because it has not had any activity in the past 60 days. It will be closed in 15 days if no further activity occurs. Thank you for your contributions.