DFA out of memory

I'm seeing a lot of errors related to regex's. It seems to something with the default allocation not being enough.

Seeing it on 1.5.33 and 1.5.32, but probably on earlier releases too, but I have not been able to confirm that due to that my tests need the search stuff in 1.5.32.

```
WARNING: All log messages before absl::InitializeLog() is called are written to STDERR
I0000 00:00:1745820985.961347 13 emulator_main.cc:39] Cloud Spanner Emulator running.
I0000 00:00:1745820985.961362 13 emulator_main.cc:40] Server address: 0.0.0.0:9010
2025/04/28 06:16:26 gateway.go:151: Cloud Spanner emulator running.
2025/04/28 06:16:26 gateway.go:152: REST server listening at 0.0.0.0:9020
2025/04/28 06:16:26 gateway.go:153: gRPC server listening at 0.0.0.0:9010
external/com_googlesource_code_re2/re2/re2.cc:842: DFA out of memory: pattern length 41, program size 117214, list count 29752, bytemap range 106
external/com_googlesource_code_re2/re2/re2.cc:842: DFA out of memory: pattern length 27, program size 117373, list count 29802, bytemap range 105
external/com_googlesource_code_re2/re2/re2.cc:842: DFA out of memory: pattern length 41, program size 117214, list count 29752, bytemap range 106
external/com_googlesource_code_re2/re2/re2.cc:842: DFA out of memory: pattern length 27, program size 117373, list count 29802, bytemap range 105
external/com_googlesource_code_re2/re2/re2.cc:842: DFA out of memory: pattern length 41, program size 117214, list count 29752, bytemap range 106
external/com_googlesource_code_re2/re2/re2.cc:842: DFA out of memory: pattern length 27, program size 117373, list count 29802, bytemap range 105
external/com_googlesource_code_re2/re2/re2.cc:842: DFA out of memory: pattern length 41, program size 117214, list count 29752, bytemap range 106
external/com_googlesource_code_re2/re2/re2.cc:842: DFA out of memory: pattern length 27, program size 117373, list count 29802, bytemap range 105
external/com_googlesource_code_re2/re2/re2.cc:842: DFA out of memory: pattern length 41, program size 117214, list count 29752, bytemap range 106
external/com_googlesource_code_re2/re2/re2.cc:842: DFA out of memory: pattern length 27, program size 117373, list count 29802, bytemap range 105
external/com_googlesource_code_re2/re2/re2.cc:842: DFA out of memory: pattern length 41, program size 117214, list count 29752, bytemap range 106
external/com_googlesource_code_re2/re2/re2.cc:842: DFA out of memory: pattern length 27, program size 117373, list count 29802, bytemap range 105
external/com_googlesource_code_re2/re2/re2.cc:842: DFA out of memory: pattern length 41, program size 117214, list count 29752, bytemap range 106
external/com_googlesource_code_re2/re2/re2.cc:842: DFA out of memory: pattern length 27, program size 117373, list count 29802, bytemap range 105
external/com_googlesource_code_re2/re2/re2.cc:842: DFA out of memory: pattern length 41, program size 117214, list count 29752, bytemap range 106
external/com_googlesource_code_re2/re2/re2.cc:842: DFA out of memory: pattern length 27, program size 117373, list count 29802, bytemap range 105
external/com_googlesource_code_re2/re2/re2.cc:842: DFA out of memory: pattern length 41, program size 117214, list count 29752, bytemap range 106
external/com_googlesource_code_re2/re2/re2.cc:842: DFA out of memory: pattern length 27, program size 117373, list count 29802, bytemap range 105
external/com_googlesource_code_re2/re2/re2.cc:842: DFA out of memory: pattern length 41, program size 117214, list count 29752, bytemap range 106
external/com_googlesource_code_re2/re2/re2.cc:842: DFA out of memory: pattern length 27, program size 117373, list count 29802, bytemap range 105
external/com_googlesource_code_re2/re2/re2.cc:842: DFA out of memory: pattern length 41, program size 117214, list count 29752, bytemap range 106
external/com_googlesource_code_re2/re2/re2.cc:842: DFA out of memory: pattern length 27, program size 117373, list count 29802, bytemap range 105
```

I'm having a lot of problems with insert queries timing out (the emulator locking up) but I've not been able to confirm it is related to this. (I'm getting segfaults when running the docker build)