executors/sbcl: increase memory limit

[int-y1]

the latest version of sbcl is more bloated

before:

0.972 Testing SBCL:   os_alloc_gc_space(1,0xb7ffb00000,173015040) failed with ENOMEM                                                                                                                       
1.032 fatal error encountered in SBCL pid 14 tid 14:                                                                                                                                                       
1.033 Can't allocate 0xa500000 bytes for space 5
1.033 
1.034 Failed self-test
1.035   Attempted:
1.036     sbcl: /usr/bin/sbcl
1.036   Errors:
1.037     Got unexpected stdout output:
1.037     
1.037 
1.038 Configuration result:
1.039 runtime: {}

after:

1.297 Testing SBCL:   Using /usr/bin/sbcl                                                                                                                                                                  
1.407   sbcl: 2.4.11                                                                                                                                                                                       
1.411 
1.411 Configuration result:
1.413 runtime:
1.413   sbcl: /usr/bin/sbcl

[dmoj-build]

Can one of the admins verify this patch?

[quantum5]

Bloated indeed.