Update httpd

Changes:

- https://github.com/docker-library/httpd/commit/e073a36: Merge pull request https://github.com/docker-library/httpd/pull/270 from dzmitry-rudnouski/alpine-3.21
- https://github.com/docker-library/httpd/commit/500ef8b: alpine 3.21
- https://github.com/docker-library/httpd/commit/aec1836: Update README
- https://github.com/docker-library/httpd/commit/bebe68a: Update `generate-stackbrew-library.sh` to support `BASHBREW_LIBRARY` for easier cascading updates

library/httpd

@@ -1,4 +1,4 @@
-# this file is generated via https://github.com/docker-library/httpd/blob/c87146e71508462f0ebd5de9890a0f8bb3b98c8f/generate-stackbrew-library.sh
+# this file is generated via https://github.com/docker-library/httpd/blob/bebe68a7d53cd886740d7b2196dae65a7815ec3d/generate-stackbrew-library.sh
 
 Maintainers: Tianon Gravi <[email protected]> (@tianon),
              Joseph Ferguson <[email protected]> (@yosifkit)
@@ -9,7 +9,7 @@ Architectures: amd64, arm32v5, arm32v7, arm64v8, i386, mips64le, ppc64le, s390x
 GitCommit: 3056c115a9f3c2467cc6f67470cfded70c4adc64
 Directory: 2.4
 
-Tags: 2.4.62-alpine, 2.4-alpine, 2-alpine, alpine, 2.4.62-alpine3.20, 2.4-alpine3.20, 2-alpine3.20, alpine3.20
+Tags: 2.4.62-alpine, 2.4-alpine, 2-alpine, alpine, 2.4.62-alpine3.21, 2.4-alpine3.21, 2-alpine3.21, alpine3.21
 Architectures: amd64, arm32v6, arm32v7, arm64v8, i386, ppc64le, riscv64, s390x
-GitCommit: 3056c115a9f3c2467cc6f67470cfded70c4adc64
+GitCommit: 500ef8b71bdf49020ec5bffad2b100936c3f2fab
 Directory: 2.4/alpine