fix: information disclosure bug in preconditions GET (#19810)

precondition check was being honored before, validating
if anonymous access is allowed on the metadata of an
object, leading to metadata disclosure of the following
headers.

```
Last-Modified
Etag
x-amz-version-id
Expires:
Cache-Control:
```

although the information presented is minimal in nature,
and of opaque nature. It still simply discloses that an
object by a specific name exists or not without even having
enough permissions.

docs/debugging/build.sh

@@ -2,5 +2,6 @@
 
 export CGO_ENABLED=0
 for dir in docs/debugging/*/; do
-	go build -C ${dir} -v
+	bin=$(basename ${dir})
+	go build -C ${dir} -o ${PWD}/${bin}
 done

docs/debugging/inspect/go.mod

@@ -1,6 +1,6 @@
 module github.com/minio/minio/docs/debugging/inspect
 
-go 1.19
+go 1.21
 
 require (
 	github.com/klauspost/compress v1.17.4

docs/debugging/pprofgoparser/go.mod

@@ -1,3 +1,3 @@
 module github.com/minio/minio/docs/debugging/pprofgoparser
 
-go 1.19
+go 1.21

docs/debugging/reorder-disks/go.mod

@@ -1,5 +1,5 @@
 module github.com/minio/minio/docs/debugging/reorder-disks
 
-go 1.19
+go 1.21
 
-require github.com/minio/pkg/v2 v2.0.6
+require github.com/minio/pkg/v3 v3.0.1

docs/debugging/reorder-disks/go.sum

@@ -1,2 +1,2 @@
-github.com/minio/pkg/v2 v2.0.6 h1:n+PpbSMaJK1FfQkP55l1y0wj5Hi9R5w2DtGhxiGdP9I=
-github.com/minio/pkg/v2 v2.0.6/go.mod h1:Z9Z/LzhTIxZ6zhPeW658vmLRilRek3zBOqNB9j+lxSY=
+github.com/minio/pkg/v3 v3.0.1 h1:qts6g9rYjAdeomRdwjnMc1IaQ6KbaJs3dwqBntXziaw=
+github.com/minio/pkg/v3 v3.0.1/go.mod h1:53gkSUVHcfYoskOs5YAJ3D99nsd2SKru90rdE9whlXU=

docs/debugging/xattr/go.mod

@@ -1,6 +1,6 @@
 module github.com/minio/minio/docs/debugging/xattr
 
-go 1.19
+go 1.21
 
 require (
 	github.com/olekukonko/tablewriter v0.0.5