Upgrade to Go 1.24 to fix standard library vulnerabilities

Updates Go version from 1.23.4 to 1.24.13 to address 10 security
vulnerabilities in the standard library:
- GO-2026-4340, GO-2026-4337 in crypto/tls
- GO-2025-4175, GO-2025-4155, GO-2025-4013, GO-2025-4007 in crypto/x509
- GO-2025-4011 in encoding/asn1
- GO-2025-4010 in net/url
- GO-2025-4009 in encoding/pem
- GO-2025-4008 in crypto/tls

Author: ecordell

.github/workflows/build-test.yaml

@@ -8,7 +8,7 @@ on:  # yamllint disable-line rule:truthy
     branches:
       - "*"
 env:
-  GO_VERSION: "~1.23.4"
+  GO_VERSION: "~1.24.13"
 jobs:
   unit:
     name: "Unit"

.github/workflows/lint.yaml

@@ -8,7 +8,7 @@ on:  # yamllint disable-line rule:truthy
   pull_request:
     branches: ["*"]
 env:
-  GO_VERSION: "~1.23.4"
+  GO_VERSION: "~1.24.13"
 jobs:
   lint:
     name: "Lint"

go.mod

@@ -1,3 +1,3 @@
 module github.com/authzed/ctxkey
 
-go 1.23.4
+go 1.24