Log message:
Updated lang/racket to version 6.12.

First and foremost, I have added some patches that disable MPROTECT for
some Racket executables and fix PR pkg/53467.

As for changes since the latest version, 6.11, these include:
* Changed the way some unsafe operations are exposed via `ffi/unsafe`
  libraries to help smooth a future transition to a new runtime system.

* The `syntax-parse` form supports unwinding side-effects when it
  backtracks, both explicitly with `~undo` patterns and implicitly
  with the built-in managed state (using `syntax-parse-state-ref`,
  etc).

* The `db` library supports SCRAM-SHA-256 authentication for backends
  running PostgreSQL 10 or later. Client support for SCRAM and other
  SASL mechanisms is provided by the new `sasl` library.

* The `lazy-require-syntax` form supports lazy loading of macro
  transformers. Note that the macros must obey certain implementation
  constraints (see the `lazy-require-syntax` documentation).

* Typed Racket no longer enforces types like `(U String (Boxof String))`
  with the `any/c` contract. This fixes a type soundness issue, but may
  affect performance. Please submit a bug report if you find a program
  that runs significantly slower on v6.12 than earlier versions.

* Typed Racket's type instantiation (`inst`) uses `Any` for omitted type
  arguments, allowing APIs to add additional type variables to functions
  without breaking existing programs.

* `for/fold` users can customize the final result of a loop's computation
  using the `#:result` keyword.

* The `--deps` option to `raco test` tests the packages the argument
  packages depends on, in addition to testing the packages themselves.
  For example, `raco test -p --deps pkg1 pkg2` tests all files from
  `pkg1`, `pkg2`, and all of their dependencies.

Log message:
Recursive revbump from textproc/icu-62.1

Log message:
Recursive bump for new fribidi dependency in pango.

Log message:
revbump after icu update

Log message:
Recursive bumps for fontconfig and libzip dependency changes.

Log message:
racket: regen distinfo

No change to checksum, just remove comments (!)

Log message:
Update to v6.11

* Typed Racket supports refinement types and dependent function types.
  Previously an experimental feature, refinement types allow types to
  describe more interesting properties of values, especially integers.
  For example, this type shows that the `max` function always produces a
  number at least as big as its inputs:
  `(-> ([x : Integer] [y : Integer])
       (Refine [z : Integer] (and (>= z x) (>= z y))))`

* DrRacket's Program Contour is significantly more efficient; using it
  no longer hurts DrRacket's interactivity.

* The `web-server/formlets` library produces formlets that are
  serializable, facilitating dynamic uses of formlets in stateless #lang
  web-server servlets. The new `web-server/formlets/stateless` and
  `web-server/formlets/unsafe` libraries provide additional support with
  the same API.

* The `db` library supports the Cassandra database.

Log message:
Update mirror list from https://download.racket-lang.org

Log message:
Cleanup: replace curly braces with parentheses.

Log message:
Revbump after textproc/icu update