No. There is nowhere that suggests that Paul released the Chrisitians he imprisoned.
And we can't even assume that those he imprisoned were still under his control after he "committed them to prison." (Though if he could free them, it's reasonable to assume he would have.)
Paul's repentance (or what we know of it) was his ministry.
Then Ananias answered, Lord, I have heard by many of this man, how
much evil he hath done to thy saints at Jerusalem...
But the Lord said unto him, Go thy way: for he is a chosen vessel unto
me, to bear my name before the Gentiles, and kings, and the children
And Ananias went his way, and entered into the house; and putting his
hands on him...
And straightway he preached Christ in the synagogues, that he is the
Son of God.
But all that heard him were amazed, and said; Is not this he that
destroyed them which called on this name in Jerusalem, and came hither
for that intent, that he might bring them bound unto the chief
But Saul increased the more in strength, and confounded the Jews which
dwelt at Damascus, proving that this is very Christ.