[botan] Use bash from PATH rather then /bin (#32285)

* [botan] Use bash from PATH rather then /bin (microsoft/vcpkg#32284)

The configure script used to invoke python during the build process contains
a shebang that invokes /bin/bash independend of whatever bash would usually
resolve to.

This breaks compilation on FreeBSD, where bash isn't part of the operating
system.

Rather then /bin/bash, invoke /usr/bin/env bash, which resolves the bash
command by iterating PATH.

* [botan] bump portrevision (microsoft/vcpkg#32284)

* [botan] regenerate versions repository (microsoft/vcpkg#32284)

ports/botan/configure

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 set -e
 

ports/botan/vcpkg.json

@@ -1,7 +1,7 @@
 {
   "name": "botan",
   "version": "2.19.3",
-  "port-version": 1,
+  "port-version": 2,
   "description": "A cryptography library written in C++11",
   "homepage": "https://botan.randombit.net",
   "license": "BSD-2-Clause",

versions/b-/botan.json

@@ -1,5 +1,10 @@
 {
   "versions": [
+    {
+      "git-tree": "575322265c701c0ff15d79c65a47ad38e7958235",
+      "version": "2.19.3",
+      "port-version": 2
+    },
     {
       "git-tree": "7b9240ee18f12e8acaedf11613aa6bc1d7aad9d5",
       "version": "2.19.3",

versions/baseline.json

@@ -1250,7 +1250,7 @@
     },
     "botan": {
       "baseline": "2.19.3",
-      "port-version": 1
+      "port-version": 2
     },
     "box2d": {
       "baseline": "2.4.1",