Update src checksum because the upstream 3.1.2 tarball has been changed

The old/new upstream tarballs for v3.1.2 difference follows:

diff -ruN scons-3.1.2/src/engine/SCons/Tool/mingw.py new-scons-3.1.2/src/engine/SCons/Tool/mingw.py
--- scons-3.1.2/src/engine/SCons/Tool/mingw.py	2019-12-17 06:12:47.000000000 +0330
+++ new-scons-3.1.2/src/engine/SCons/Tool/mingw.py	2019-12-17 06:33:22.000000000 +0330
@@ -47,6 +47,7 @@
     r'c:\MinGW\bin',
     r'C:\cygwin64\bin',
     r'C:\msys64',
+    r'C:\msys64\mingw64\bin',
     r'C:\cygwin\bin',
     r'C:\msys',
 ]
diff -ruN scons-3.1.2/src/RELEASE.txt new-scons-3.1.2/src/RELEASE.txt
--- scons-3.1.2/src/RELEASE.txt	2019-12-17 06:12:47.000000000 +0330
+++ new-scons-3.1.2/src/RELEASE.txt	2019-12-17 06:33:22.000000000 +0330
@@ -86,5 +86,3 @@
      1  jw0k

-__COPYRIGHT__
-__FILE__ __REVISION__ __DATE__ __DEVELOPER__

1 files changed, 3 insertions, 3 deletions

diff --git a/.SRCINFO b/.SRCINFO
index c175a5f01706..746fb5254e20 100644
--- a/.SRCINFO
+++ b/.SRCINFO
@@ -1,9 +1,9 @@
 # Generated by mksrcinfo v8
-# Thu Jun 30 14:14:40 UTC 2022
+# Thu Aug 25 14:50:09 UTC 2022
 pkgbase = scons2
 	pkgdesc = Extensible Python-based build utility (Python2 version)
 	pkgver = 3.1.2
-	pkgrel = 4
+	pkgrel = 5
 	url = https://scons.org
 	arch = any
 	license = MIT
@@ -15,7 +15,7 @@ pkgbase = scons2
 	provides = python2-scons
 	conflicts = python2-scons
 	source = scons-3.1.2.tar.gz::https://github.com/scons/scons/archive/3.1.2.tar.gz
-	sha512sums = 7d597e681d00918342c64afc61410d961f0516f2e054669d3ef76fcddcbf13b4e24990bdd7c46f3f4369ad2f45ba3fe0173e33edc15e846096bbea10b23fb7c1
+	sha512sums = b096501ea37e62f596f16b46b4022ad7979f359b10849d4c5fa17731a6c3ec34e0890374de175a8aa7539ae677777142ccf5dfae39a74696efcdbcc00e89bccf
 
 pkgname = scons2