golangci.yml: update regex for ignoring SA1019

The message changed from "is deprecated" to "has been deprecated":

    client/hijack.go:85:16: SA1019: httputil.NewClientConn has been deprecated since Go 1.0: Use the Client or Transport in package net/http instead. (staticcheck)
        clientconn := httputil.NewClientConn(conn, nil)
                      ^
    integration/plugin/authz/authz_plugin_test.go:180:7: SA1019: httputil.NewClientConn has been deprecated since Go 1.0: Use the Client or Transport in package net/http instead. (staticcheck)
        c := httputil.NewClientConn(conn, nil)
             ^
    integration/plugin/authz/authz_plugin_test.go:479:12: SA1019: httputil.NewClientConn has been deprecated since Go 1.0: Use the Client or Transport in package net/http instead. (staticcheck)
        client := httputil.NewClientConn(conn, nil)
                  ^

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

hack/validate/golangci-lint.yml

@@ -86,11 +86,11 @@ issues:
       linters:
         - staticcheck
     # FIXME temporarily suppress these. See #39926
-    - text: "SA1019: httputil.NewClientConn is deprecated"
+    - text: "SA1019: httputil.NewClientConn"
       linters:
         - staticcheck
     # FIXME temporarily suppress these (related to the ones above)
-    - text: "SA1019: httputil.ErrPersistEOF is deprecated"
+    - text: "SA1019: httputil.ErrPersistEOF"
       linters:
         - staticcheck
     # This code is doing some fun stuff with reflect and it trips up the linter.