change normalization of alphanum terms (#439)

* change normalization of alphanum terms

Signed-off-by: Mariana Graterol Fuenmayor <marianag@nvidia.com>

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* address review

Signed-off-by: Mariana Graterol Fuenmayor <marianag@nvidia.com>

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

---------

Signed-off-by: Mariana Graterol Fuenmayor <marianag@nvidia.com>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

Author: mgrafu

tests/nemo_text_processing/en/data_text_normalization/test_cases_serial.txt

@@ -31,4 +31,4 @@ a 4-kilogram bag~a four-kilogram bag
 2*8~two asterisk eight
 my pnr is t2000~my pnr is t two thousand
 your otp is ab9453~your otp is ab nine four five three
-password is a/b&c12&d~password is a/b&c twelve &d
+password is a/b&c12&d~password is a/b&c twelve &d