chore(deps): update dependency go to v1.22.6 (#1297)

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This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [go](https://go.dev/) ([source](https://togithub.com/golang/go)) |
toolchain | minor | `1.21.4` -> `1.22.6` |

---

### Release Notes

<details>
<summary>golang/go (go)</summary>

###
[`v1.22.6`](https://togithub.com/golang/go/compare/go1.22.5...go1.22.6)

###
[`v1.22.5`](https://togithub.com/golang/go/compare/go1.22.4...go1.22.5)

###
[`v1.22.4`](https://togithub.com/golang/go/compare/go1.22.3...go1.22.4)

###
[`v1.22.3`](https://togithub.com/golang/go/compare/go1.22.2...go1.22.3)

###
[`v1.22.2`](https://togithub.com/golang/go/compare/go1.22.1...go1.22.2)

###
[`v1.22.1`](https://togithub.com/golang/go/compare/go1.22.0...go1.22.1)

###
[`v1.22.0`](https://togithub.com/golang/go/compare/go1.21.10...go1.22.0)

###
[`v1.21.13`](https://togithub.com/golang/go/compare/go1.21.12...go1.21.13)

###
[`v1.21.12`](https://togithub.com/golang/go/compare/go1.21.11...go1.21.12)

###
[`v1.21.11`](https://togithub.com/golang/go/compare/go1.21.10...go1.21.11)

###
[`v1.21.10`](https://togithub.com/golang/go/compare/go1.21.9...go1.21.10)

###
[`v1.21.9`](https://togithub.com/golang/go/compare/go1.21.8...go1.21.9)

###
[`v1.21.8`](https://togithub.com/golang/go/compare/go1.21.7...go1.21.8)

###
[`v1.21.7`](https://togithub.com/golang/go/compare/go1.21.6...go1.21.7)

###
[`v1.21.6`](https://togithub.com/golang/go/compare/go1.21.5...go1.21.6)

###
[`v1.21.5`](https://togithub.com/golang/go/compare/go1.21.4...go1.21.5)

</details>

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core/go.mod

@@ -2,7 +2,7 @@ module github.com/open-feature/flagd/core
 
 go 1.21
 
-toolchain go1.21.4
+toolchain go1.22.6
 
 require (
 	buf.build/gen/go/open-feature/flagd/grpc/go v1.5.1-20240215170432-1e611e2999cc.1

flagd-proxy/go.mod

@@ -2,7 +2,7 @@ module github.com/open-feature/flagd/flagd-proxy
 
 go 1.21
 
-toolchain go1.21.4
+toolchain go1.22.6
 
 require (
 	buf.build/gen/go/open-feature/flagd/grpc/go v1.5.1-20240215170432-1e611e2999cc.1

flagd/go.mod

@@ -2,7 +2,7 @@ module github.com/open-feature/flagd/flagd
 
 go 1.21
 
-toolchain go1.21.4
+toolchain go1.22.6
 
 require (
 	buf.build/gen/go/open-feature/flagd/connectrpc/go v1.16.2-20240215170432-1e611e2999cc.1