Jennifer Garner’s two divorces haven’t scared her off from marriage. A source tells In Touch the Camping actress, 47, is about to wed her boyfriend of 10 months, CaliBurger CEO John Miller, 41. “They’ve set a tentative wedding date for the end of summer,” says the insider, “although it could be pushed to early fall. Jen’s excited. She really wants to be a wife again — the commitment of marriage is important to her, and she really trusts that John will be a good husband and stepfather [to her kids with Ben Affleck, Violet, 13, Seraphina, 10, and Samuel, 7].” Even Ben, 46, approves, adds the source: “They met a couple of times and got along well. Jen has his blessing.”…