chore: bump Go version to 1.26.5

Sets the go version for all relevant locations to 1.26.5. This has
some nice features including an errors.AsType function which can
replace some of our type switches while maintaining style.

Author: Chris Stockton

Dockerfile

@@ -1,4 +1,4 @@
-FROM golang:1.25.12-alpine3.23 as build
+FROM golang:1.26.5-alpine3.23 as build
 ENV GO111MODULE=on
 ENV CGO_ENABLED=0
 ENV GOOS=linux

Dockerfile.dev

@@ -1,4 +1,4 @@
-FROM golang:1.25.12-alpine3.23
+FROM golang:1.26.5-alpine3.23
 ENV GO111MODULE=on
 ENV CGO_ENABLED=0
 ENV GOOS=linux

go.mod

@@ -186,6 +186,6 @@ require (
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 )
 
-go 1.25.12
+go 1.26.5
 
 replace github.com/joho/godotenv => ./internal/forks/godotenv

go.sum

@@ -632,8 +632,6 @@ google.golang.org/genproto/googleapis/api v0.0.0-20260526163538-3dc84a4a5aaa h1:
 google.golang.org/genproto/googleapis/api v0.0.0-20260526163538-3dc84a4a5aaa/go.mod h1:q4lMZS6kskjT5HvCPrnnypcDPVJqT/f4nfxmkE7gryY=
 google.golang.org/genproto/googleapis/rpc v0.0.0-20260526163538-3dc84a4a5aaa h1:mZHHdPZl0dbGHCflZgAq/Q468DWVFcU2whhB2KAo8fk=
 google.golang.org/genproto/googleapis/rpc v0.0.0-20260526163538-3dc84a4a5aaa/go.mod h1:4Hqkh8ycfw05ld/3BWL7rJOSfebL2Q+DVDeRgYgxUU8=
-google.golang.org/grpc v1.81.1 h1:VnnIIZ88UzOOKLukQi+ImGz8O1Wdp8nAGGnvOfEIWQQ=
-google.golang.org/grpc v1.81.1/go.mod h1:xGH9GfzOyMTGIOXBJmXt+BX/V0kcdQbdcuwQ/zNw42I=
 google.golang.org/grpc v1.82.1 h1:NnAxzGRA0677vCa4BUkOAnO5+FfQqVl9iUXeD0IqcGE=
 google.golang.org/grpc v1.82.1/go.mod h1:yzTZ1TB1Z3SG+LIYaI+WiE8D5+PZ3ArnrSp8zF3+/ZA=
 google.golang.org/protobuf v1.36.11 h1:fV6ZwhNocDyBLK0dj+fg8ektcVegBBuEolpbTQyBNVE=

internal/forks/godotenv/go.mod

@@ -1,3 +1,3 @@
 module github.com/joho/godotenv
 
-go 1.25.12
+go 1.26.5

tools/go.mod

@@ -1,6 +1,6 @@
 module github.com/supabase/auth/tools
 
-go 1.25.12
+go 1.26.5
 
 tool (
 	github.com/securego/gosec/v2/cmd/gosec